CUT FACING STONE, DIMENSION STONE, AND BROKEN ASHLER MASONRY.

(49.) Joint Dressing.-The beds, builds and joints of cut facing stone and dimension stone are to be dressed for the full depth of the stones to surfaces that will allow the stones to be laid with a joint not exceeding three eighths of an inch in thickness. The beds, builds and joints of the granite dimension stone used for trimmings, cornice, coping, &c., to be cut to a quarter-inch joint and to their full depth, also the broken ashler masonry.

No plug-holes or cavities more than six inches long or nearer than three inches to an arris will be allowed; and in any bed, build or joint, the aggregate area of the plug-holes or cavities must not exceed one quarter of the whole area.

(50.) Headers.—An adequate number of headers will be required in all masonry-about one in every 25 square feet of face area.

(51.) Face Dressing.-The exposed faces of the stones shall be either left with a rock or quarry face, rough pointed or fine hammered (6-cut work), as may be directed by the Engineer.

The various classes of face dressing must be equal in quality and appearance to those on the sample in the office of the Chief Engineer.

(52.) Payment for Face Dressing.-The cost of preparing the rock faces is included in the price per cubic yard stipulated for the particular class of masonry, clause item

>

For rough pointed and fine hammered (6-cut) dressing, a price per square foot of dressing will be paid in addition to the price per cubic yard of masonry, viz.:

For rough pointed dressing, the price stipulated in clause dressing, the price stipulated in clause , item

, item

(53.) Rock-face Dressing. In rock face work the arrises of the stones inclosing the rock face must be pitched to true lines; the face projections to be bold and from 3 to 6 inches beyond the arrises. The angles of all walls on structures having rock faces are to be defined by a chisel draft not less than one and a half inches wide on each face.

and for fine hammered (6-cut)

(54.) Rough-pointed Dressing. In rough pointed work the stones shall at all points be full to the true plane of the face, and at no point shall project beyond more than 1-4 inch, the arrises to be sharp and well defined.

(55.) Fine Hammered (6-cut) Dressing.-In fine hammered work the face of the stones must be brought to a true plane and fine dressed with a hammer having six blades to the inch; the arrises to be true to line, sharp and well defined.

(56.) Joints and Pointing.—Cut facing stones and granite dimension stone masonry for the chambers are to be laid with joints not exceeding 3-8 inch in thickness, and the face of the joints is to be pointed with pure Portland cement. This pointing must be done with the utmost care, in order to secure water tight-joints. The joints are to be raked out and cleaned to a depth of one and a half inches from the face, thoroughly moistened and then filled with pure cement well forced in and rubbed down to a surface even with the face surface of the masonry. Any defects found in the pointing before the work is accepted shall be immediately corrected,

(57.) Cut Facing Stone Masonry.-For cut facing stone masonry the stones must be rectangular in shape, except where connections and closures are to be made.

All cut facing stone masonry, except where otherwise shown or specified, is to be laid in rectangular courses not less than 15 inches nor more than 30 inches build, and with a face bond of not less than 12 inches lap.

Where this class of masonry joins with granite dimension stone masonry, the courses must correspond, and the joining with arches and other dimension stone masonry must be accurate and workmanlike. The stones to be not less than 3 feet long, with a bed equal to the height of the course; to be well bonded with the backing by numerous headers, projecting, at least, one foot into the backing, as shown on the plans, or as may be directed from time to time.

The face dressing of this class of masonry in the gate chambers will be generally rough pointed; a portion is to be fine hammer (6-cut).

The coping for the fence about the grounds will be classed as granite dimension stone masonry; all the exposed faces of this coping are to be rough pointed.

(58.) In estimating the quantities of cut facing stone masonry, for payment, the depth of the masonry from the face of the wall will in all cases be taken as 24 inches.

The tails of the headers will be estimated as of the class of masonry into which they project, and to which they must conform.

No payment shall be made for cutting grooves and recesses other than the price paid for the dressing of their surfaces, which are to be equal to fine hammered.

(59.) Granite Dimension Stone Masonry.-Granite dimension stone masonry shall be of first quality granite. The stones are to be cut to dimensions required by the detail plans to be given from time to time by the Engineer.

The faces of the stones to which the gates are to be fastened, the exposed faces of the gate openings,

the tops of the gateway sills and coping of the walls of the gate-house foundations and gate chambers, and any other surface that may be designated by the Engineer, are to be fine hammered. The surfaces of all chamfers, grooves and recesses are also to be equal to fine hammered, but no payment other than for this dressing will be made for the cutting of the chamfers, grooves and recesses.

The other exposed surfaces of this class of dimension stone masonry will, in general, be rough pointed. (60.) Granite Dimension Stone Masonry for Voussoirs, Window Sills, Cornice, Water Table and Trimmings.—Granite dimension stone masonry used for voussoirs, window sills, cornice, water table and other trimmings, shall be of first quality granite, even in color. The stones are to be cut to dimensions required by the detail plans to be given from time to time by the Engineer.

The faces of this class of stone are to be mostly (6-cut) fine hammered. The joints for this class of dimension stone shall be cut so as not to exceed a quarter inch joint when laid.

(61.) Dimension Stone Masonry for Exposed Portion of Base of Superstructure having Rock Face.-Dimension stone masonry for exposed portion of the base of the superstructure, having a rock face, and a batter of one in six, must be cut from stone of first quality, either of dark granite or such other dark colored stone as shall be approved by the Chief Engineer.

The stones are to be cut to dimensions shown on the detail plans to be furnished from time to time by the Engineer. The joints of this class of dimension stone shall not exceed 3-8 of an inch.

(62.) Broken Ashler Masonry for Superstructure.—Broken ashler masonry will be used for the top portion of the outer walls of the gate house superstructure, as shown on the plans, to be cut from stones approved by the Chief Engineer, and cut to form a joint when laid of 1-4 inch, properly bonded and pointed. This class of masonry is to be rock face.

IRON WORK.

(63.) Iron Work to be Furnished by Contractor.-All iron work used in this section of the Aqueduct shown on the contract plans, or such as may be ordered by the Engineer (excepting stopcocks, gates, gate machinery, gate frames and iron work for windows and doors), is to be furnished by the Contractor. The Engineer will furnish, from time to time as may be required, detail plans or working drawings for such iron work.

kind.

All iron work used for temporary purposes is to be furnished by the Contractor, at his own expense. (64.) Quality.-All materials and workmanship for the iron work must be of the best quality of their (65.) Inspection.-The quality of the iron and the process of manufacture will at all times be subject to examination and inspection by the Engineer or his Inspector; and shall be subject to rejection, by order of the Engineer, if in his opinion it be not of the quality called for.

(66.) Notice.-The Contractor shall notify the Chief Engineer, in writing, at least seven days prior to the beginning of the manufacture of said iron work, in order that an Inspector may be present.

(67.) Convenience for Inspection.-The Contractor at his own expense shall furnish the Engineer or Inspector with men and every facility for moving the castings or wrought-iron work, as may be required for convenience of proper inspection.

(68.) Scales to be Furnished.-The Contractor shall furnish proper sealed scales for weighing the iron work, either at the place of manufacture or on the grounds of the City where such iron work is to be used.

(69.) Proper Tests.—All iron work will be subjected to test, as provided for hereinafter.

(70.) Specimens to be Furnished.—At the expense of the Contractor, specimens (of proper size and dimensions) of the materials used shall be delivered to the Engineer or Inspector, whenever required. (71.) Rejection.-The approval of any iron work by the Inspector shall not prevent its rejection for any defects which may be discovered at any time before the final inspection and acceptance thereof, and payment therefor, on the completion of the contract.

(72.) Condemned Iron Work.-If, at any time before the completion of the work, any iron work be condemned as unsuitable, the Contractor shall forthwith, at his own expense, remove the same.

(73.) Iron to be Weighed and Marked.—All iron work is to be weighed under the supervision of the Inspector, and the weight distinctly marked thereon in white paint. All pieces of iron work not weighed and marked at the place of manufacture are to be weighed at the place where such pieces are to be used.

(74.) Ton.-In making the estimate of the weight of iron work to be paid for, the ton used shall be two thousand (2,000) pounds.

Wrought-iron Work, Cast-iron Pipe, and Cast-Iron Specials (similar to the specifications on pages ).

ROOF.

(105.) Roof Truss.-The roof truss will be constructed as shown on the contract drawings, sheets The rafters made of rolled 7 inch deck beams, 3 3-4 inch flanges; also a 7 inch deck beam to run along the ridge or peak; the tension rods to be wrought iron, and of the forms shown on the detail

Nos.

drawings; the struts and heel shoes for the rafters are to be cast iron of the forms shown on the detail drawings, and the heel shoes are to be anchored to the masonry by one-inch wall bolts.

(106.) The Purlins.-The purlins to which the slates are fastened are to be two inches by two inches (2x2) angles, fastened to the rafters as shown on sheet No.

(107.) Slates.-The slates to be of the best quality of black slate 3-16 inches thick. 12 inches by 20 inches, laid 9 inches to the weather, with at least 4 inches lap, except at the rafter, where the lap must be 6 inches. The slates are to be laid in mortice and fastened down to the purlins with copper nails, clinched to the under edge of the purlin.

(108.) Flashings and Gutters.-The flashings, gutters, hip covers, ventilators, &c., are to be made of the best quality 16-ounce sheet copper, well lapped, riveted and soldered; the gutters are to be properly fastened into the joint at the base of the coping, and formed, as shown on the drawing, and to run up under the slates about 12 inches and turned down over second purlin, requiring a width of about 32 inches; the gutter to be laid on a base of brick and mortar, and to have the proper grade necessary to cause the water to flow to the leaders, which will be built in the masonry as shown on sheet No.

or as

(109.) Leaders.-The leaders will be cast iron pipe; the pipe will be 4 inches, carried down through a recess built in the masonry and connected with the drains below, at points indicated on sheet No. may be ordered during construction. The cast iron leaders will be paid for under clause , item (110.) Ventilators and Skylights.-If ventilators or skylights are ordered they will be furnished by the City, and they are to be put in the roof by the Contractor, at his expense, as directed by the Engineer. (11.) Ceiling to Roof.—The under side of the roof is to be ceiled with 3 inch by 3-4 inch yellow pine, tongued, grooved and beaded boards, properly fastened to the nailing strips at every fourth purlin, and a 2 inch moulding will be placed against the rafters.

(112.) Roof to Tower.-The roof to the tower will be constructed of brick, arched upon I beams, about as shown on sheet No.

(113.) Decoration and Painting.-The under side of roof, ceiling and iron work shall be painted as directed by the Chief Engineer, which painting is included in the price for such wood work, iron work, &c., under clause , items and and such arrange

The face brick work shall be arranged for decoration about as shown on sheet No. ment is included in the price for face or front brick masonry under clause, item

(114.) Stairways.-Spiral or other stairways will be built (of cast and wrought iron) in the gate vaults or chambers, also in the tower. They will be constructed in the usual way, out of cast and wrought iron, and will be paid for under clause, items and also any cast or wrought iron ladders required for the work and built in the masonry, will be paid for under the above items.

SPECIFICATIONS FOR DOORS, WINDOWS, SCREENS, ETC., 135TH

STREET GATE-HOUSE.

The plans or drawings referred to in these specifications are five in number, entitled "The Aqueduct Commission Contract, Detail Drawing," etc., sheets signed by the Chief Engineer and dated January 4th, 1889.

They show the character and details of the work to be done, and they must be generally followed unless otherwise ordered by the Engineer in writing.

Description of the Work.-The work to be done consists in furnishing all materials, the doing of all work or labor necessary to construct, paint, fit and put in place, in perfect working order, at the New Gate House, 135th Street and Convent Avenue, New York City, two single iron doors two double iron doors, two windows, 4 ft. 9 in. by 8 ft. 7 in. opening; four windows, 4 ft. by 8 ft. 3 in. opening; five windows, 2 ft. 10 in. by 4 ft. 5 in. opening; two windows, 2 ft. by 7 ft. 3 in. opening; eight "Bulls-eye" windows, 2 ft. 6 in. opening, including netting and wrought-iron guards where required; also sixty-eight 5 ft. by 7 ft. 2 in. No. 10 brass wire screens inch mesh for gate chamber.

Iron Doors.-The single and double iron doors called for shall be constructed about as shown on the drawings (Sheets ) of wrought and cast-iron. The casing to the doors and that of the transoms to be of cast-iron, bolted to the granite as shown, or as the Engineer may direct. The panel to the doors to be of cast iron and ornamented. The transom sash to be of first quality oak, glazed with heavy cathedral stained glass, the colors to be selected and arranged as the Engineer may direct.

The doors, are to be hinged as shown on the drawing, and to be provided with heavy bronze bolts, also bronze lock, to be selected or approved by the Engineer.

A wire netting of No. 8 wire inch mesh shall also be fastened to the exterior face of the transom sashes. Windows.-The windows are to be constructed about as shown on (Sheets ) the drawings.

The frames and sashes to be of first quality oak. Lower portion of window to be glazed with the best quality double-thick German or French glass; the transom sash to be glazed with heavy cathedral stained glass, of selected colors and the arrangement to be approved by the Engineer.

A wire netting of No. 8 wire

inch mesh, to cover the entire opening, also in. by 1 in. wroughtiron guards, to be provided and put in place as shown on Sheet

Screens for Chambers.-The screens are 5 ft. by 7 ft. 2 in. over all; the frame shall be constructed of 3 in. by 4 in. first quality cak, put together as shown on Sheet, with brass screws. The wire cloth or screen to be of first class No. 10 brass wire, with a inch mesh or opening between the wire. The wire cloth to be fastened to the frames with brass screws, spaced about as shown on Sheet of the contract drawings. Painting. The materials for the doors, windows, netting, guards, and screens shall be painted with two or more coats of such paint as the Engineer shall direct. Great care shall be taken in painting, so as to prevent rust from forming, and discoloring the granite work of the building, a last coat to be applied to the work after it is in place.

Quality of Work.-All the above work shall be done in a first class and workmanlike manner and to the satisfaction of the Engineer. All materials to be of the first quality of their kind.

F. (1.) Plans.-The plans referred to in these specifications are fifteen in number, entitled "The Aqueduct Commission," etc., Nos. signed by the Chief Engineer, and dated

They show the location of the work, and its general character.

During the progress of the work, such working plans will be furnished from time to time by the Engineer, as he may deem necessary.

(2.) Borings.—Some test pits have been made to ascertain the nature of the ground where this section is to be built and the result of these tests has been shown on the plans; should the character and extent of the various materials be found to differ from what is indicated, the Contractor shall have no claim on that account, and it is expressly understood that the Corporation of the City of New York does not warrant the indications of the tests to be correct.

(3.) General Description of the Work.-All work, during its progress, and on its completion, must conform truly to the lines and levels to be given hereafter and determined by the Engineer, and must be built in accordance with the plans and directions which shall be given by him from time to time subject to such modifications and additions as said Engineer shall deem necessary during the prosecution of the work, and in no case will any work which may be performed, or any materials furnished in excess of the requirements of this contract or of the plans, or of the specifications, be estimated and paid for unless such excess shall have been ordered by the Engineer, as herein set forth.

The Contractor is to furnish all materials (except such as may be obtained from the excavations), and all tools, implements, machinery and labor (necessary or convenient for doing all the work herein contracted for, with safety to life and property in accordance with this contract, and within the time specified herein) required to construct and put in complete working order the section of Aqueduct herein specified, and is to perform and construct all the work covered by this agreement; the whole to be done in conformity with the plans and these specifications; and all parts to be done to the satisfaction of the said Aqueduct Commissioners. The work to be done is the making, furnishing, delivering and laying of eight (8) lines of forty-eight (48") inch, pipe through Convent and Ninth Avenues from the end of the pipes projecting out of the Gate House (Section No. 15) at One Hundred and Thirty-fifth Street, to One Hundred and Twenty-fifth Street; seven (7) lines of forty-eight (48") inch, pipe through Ninth Avenue from One Hundred and Twenty-fifth Street to Manhattan Street; six (6) lines of forty-eight (48) inch, pipe through Ninth Avenue and Morningside Avenue, south from Manhattan Street to One Hundred and Tenth Street; (5) lines of forty-eight (48′) inch, pipe through New Avenue, One Hundred and Sixth Street and Eighth Avenue from One Hundred and Sixth Street to One Hundredth Street; and four (4) lines of forty-eight (48′ ) inch, pipe through Eighth Avenue to Ninety-seventh Street, and from Eighth Avenue through the Transverse Drive in Central Park to a point near a proposed Gate House located on the northerly side of the large reservoir in Central Park and of all the pipes, branch pipes, special castings, stop cocks, hydrants, blow-offs, air cocks, and all appurtenances, connected therewith.

The building of a sewer from the stop cock chamber of the One Hundred and Thirty-fifth Street Gate House to Manhattan Street, and of all other necessary sewers, sewer pipes, and drains, with the necessary manholes, basins, vaults, culverts and all other appurtenances, also the taking down, rebuilding and relaying of sewers, sewer basins and culverts where made necessary by the laying of the pipes.

The taking down and rebuilding of all walls and other masonry as directed by the Engineer.

The taking up and relaying of all water mains, stop cocks and hydrants, made necessary by the construction of the work. The excavating of all earth and rock ordered for the laying of the pipes, for the sewers, and for the construction of all other structures; also all the embankments, filling and refilling connected with the same.

The furnishing of all materials and labor for taking up and relaying pavements, curbs, gutters flagging, crosswalks, all in the places and of the sizes, dimensions and materials mentioned in the specifications or shown on the plans. The taking up and replacing of any obstruction which may be in the way of the laying of the pipes, the taking up and restoring of all work of any kind which may have been destroyed or inter

fered with during the execution of the work; and the doing of all work necessary to complete Section 16 of the New Croton Aqueduct.

The Contractor must so conduct his work, with the approval of the Engineer, as to interfere as little as possible with the public traffic on the line of the work, and whenever his work requires the removal or alteration of structures and appliances in service, he is not to interfere with them except with the permission and under the direction of the Engineer, and the work of removal or alteration or reconstruction of structures and appliances now in service as culverts, sewers and water mains and service pipes, and the taking up and relaying of the same when necessary, shall be done under the direction and supervision and subject to the inspection and acceptance of the Chief Engineer and his Assistant Engineers of the Department of Public Works.

PIPES.

(4.) Description of Pipe.-The pipes shall be circular cylinders, with the inner and outer surfaces concentric, and of the full interior diameter required.

The hub or socket, the spigot end, the branches and all other castings, shall be shaped in exact conformity with the drawings which shall be furnished. The seat or shoulder of the socket and the end of the spigot must be straight and even, so as to make a smooth joint. No pipe will be received whose eccentricity at the spigot and socket ends, or either, exceeds one-eighth (1) of an inch.

Pipes will be designated by dimensions of the interior diameter.

(5.) Gauges.-The sockets and spigots will be tested by circular gauges.

'(6.) Dimensions.—The straight pipes shall be twelve (12) feet long exclusive of the hub, all others as shall be directed.

(7.) Straight Pipes.-The pipes shall be straight in the direction of the axis of the cylinder, and the curves shall be true to the required curvature.

(8.) Thickness.-The thickness of the pipes, branches and special castings shall correspond with drawings to be furnished by the Engineer.

(9.) Tested by Calipers.-The thickness of the metal of the pipes and special castings will be tested by calipers after the castings have been freed from sand and cleaned. No pipe or casting will be received when the thickness of metal shall be found to be more than one-twelfth (1) of an inch less than the thickness required by the plans and specifications.

(10.) Weight. The weight of the straight pipes shall be approximately as follows:

The 48-inch, pipes..
The 20-inch, pipes.
The 12-inch, pipes..

The 6-inch, pipes..

.8,250 pounds each.

2,000 pounds each.

1,000 pounds each.

430 pounds each.

(11.) Variation in Weight.-No pipe will be received which weighs less than the weight above mentioned by more than two and a half (24) per cent of said weights, and no excess of weight in any one pipe of more than two and a half (24) per cent above weight, as above estimated, will be paid for.

(12.) To be Cast Vertically.-All straight pipes shall be cast vertically with the hub end down. (13.) All the castings shall be made in such moulding sand or loam as will leave the surface clean and

smooth.

(14.) Marks.—All the castings shall have the year in which they were cast, the running number of the castings of the same size and form, the letters A. C. and the initials or name of the Contractors and of the foundry where cast, cast on the outer side, in raised letters of not less than two inches in length and oneeighth of an inch in relief, in such manner as the Engineers may designate; and in case any pipe shall be condemned, the letters A. C. shall be erased by the Contractor under the direction of the Engineer.

(15.) Quality of Metal.-The metal of which the castings are to be cast (which must be remelted in the cupola or air furnace) shall be pig iron, made without any admixture of cinder iron, or other inferior metal, and shall be of such character as to make a pipe strong, tough, and of an even grain, entirely free from uncombined carbon when examined under the microscope, and such as will bear drilling and cutting satisfactorily; and the iron in the pipes and castings shall have a tensile strength of at least sixteen thousand (16,000) pounds to the square inch.

(16.) The castings shall be free from scoria, sand holes, air bubbles, and all defects and imperfections, and no plugging or filling will be allowed.

(17.) The castings shall be perfectly cleaned, and no lumps shall be left on the inner surface in the barrels or sockets or on the outer surface of the spigot end.

(18.) Hammer Inspection.-All castings, after having been perfectly cleaned according to the specifications and the direction of the Engineer, will be subjected to a careful and thorough hammer inspection.

(19.) Cleaned.-Every casting shall be thoroughly dressed and made clean and free from earth, sand and dust which adheres to the iron in the moulds. Iron or steel wire brushes must be used, as well as softer brushes, to remove the loose dust, and no acid or other liquid shall be used in cleaning the castings.

(20.) Coating.-Every pipe, branch and special casting shall be carefully coated inside and out with coal pitch and oil, and must be entirely free from rust when the coating is applied. If the casting cannot be