Professional Memoirs, Corps of Engineers, United States Army and Engineer Department at Large, Volúmenes1-5Engineer School., 1913 |
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Página ix
... light on the road . French automobile search - light under operation . German auto - searchlight with G 60 projector German G 60 outfit German G 90 outfit German G 90 power unit Crevasse from south end , looking toward river ...
... light on the road . French automobile search - light under operation . German auto - searchlight with G 60 projector German G 60 outfit German G 90 outfit German G 90 power unit Crevasse from south end , looking toward river ...
Página 28
... lights under the rough conditions of field service . The desiderata of such a mirror are : 1. Good illuminating power- a . Capable of high polish of reflecting surface ; b . Absence of light - absorptive qualities in the material . 2 ...
... lights under the rough conditions of field service . The desiderata of such a mirror are : 1. Good illuminating power- a . Capable of high polish of reflecting surface ; b . Absence of light - absorptive qualities in the material . 2 ...
Página 29
... light , and consequently other rays must be reflected from the highly polished surface and not be absorbed by the material . It is difficult to distinguish the proportions of light lost by absorp- tion of the material and that lost by ...
... light , and consequently other rays must be reflected from the highly polished surface and not be absorbed by the material . It is difficult to distinguish the proportions of light lost by absorp- tion of the material and that lost by ...
Página 31
... light from this mirror was turned , at a range of about 100 feet , on a light - colored building , and the shape and uniformity of the lighted area noted . The area was not perfectly circular in form , but slightly distorted in a 2 o ...
... light from this mirror was turned , at a range of about 100 feet , on a light - colored building , and the shape and uniformity of the lighted area noted . The area was not perfectly circular in form , but slightly distorted in a 2 o ...
Página 32
search - light . The reasons for this are ( a ) the blinding effect when the light shines on the marksman ; ( b ) the small target when firing from the side , or not in the line of the beam ; ( c ) the difficulty of ranging when there ...
search - light . The reasons for this are ( a ) the blinding effect when the light shines on the marksman ; ( b ) the small target when firing from the side , or not in the line of the beam ; ( c ) the difficulty of ranging when there ...
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anchors army artillery attack bank battalion boats bridge cable caissons canal Celilo Celilo Falls cent channel coffer cofferdam command concrete construction Corps of Engineers cost cover crest crevasse cross section curve Dalecarlia Reservoir defense depth discharge dredge drill elevation embankment enemy excavation feet field firing trenches flank flood foot front gage gauge Georgetown reservoir glass mirror ground guard lock guns Harbor Harlem River height Hell Gate high water hour improvement inches infantry Island jetty levee lift lock light Little Hell Gate low water lower material maximum metal mirror miles Mississippi Mississippi River Mobile Mobile River navigation necessary observation officers Ohio River operations piles pivot placed Plate Ponts et Chaussées position projectors protractor rear reservoir riprap rock sand search-lights segmental mirror shoals shown side slope storm surface tactical Tennessee River tidal tide tion trestle troops upper velocity wall weir width