Motive Powers and Their Practical Selection |
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Página 20
On these a man imparts a constant pressure of about 15 lbs . , which for
intermittent work may be increased towards 25 lbs . The speed at which a man
will turn a crank is from 26 to 30 revolutions per minute . Man Labour . — The
labour of one ...
On these a man imparts a constant pressure of about 15 lbs . , which for
intermittent work may be increased towards 25 lbs . The speed at which a man
will turn a crank is from 26 to 30 revolutions per minute . Man Labour . — The
labour of one ...
Página 23
The speed of a strong draught horse may be taken at 3 miles per hour . Oxen do
not walk more than 1 } miles per hour . The following table will show animal work
done at various speeds of movement . MAXIMUM POWER OF A HORSE IN ...
The speed of a strong draught horse may be taken at 3 miles per hour . Oxen do
not walk more than 1 } miles per hour . The following table will show animal work
done at various speeds of movement . MAXIMUM POWER OF A HORSE IN ...
Página 24
The pole to which the animals are to be attached is secured to this spindle , and
as it is turned by the animals ' rotary walk the bevel - wheel turns , at a
correspondingly higher speed , a horizontal pinion , which operates a shaft . This
shaft has ...
The pole to which the animals are to be attached is secured to this spindle , and
as it is turned by the animals ' rotary walk the bevel - wheel turns , at a
correspondingly higher speed , a horizontal pinion , which operates a shaft . This
shaft has ...
Página 28
It is subject to variations ascertainable by the use of a barom - . eter . Being a fluid
, this pressure is exerted by it on all points of access . Wind . — When in motion
the moving mass of air is called wind , and exerts a pressure due to its speed ...
It is subject to variations ascertainable by the use of a barom - . eter . Being a fluid
, this pressure is exerted by it on all points of access . Wind . — When in motion
the moving mass of air is called wind , and exerts a pressure due to its speed ...
Página 31
The following rules enable area , speed , and power of windmills to be calculated
: To find the horse - power developed by a windmill : V = velocity of wind in feet
per second ; A = total area of all the sails in square feet ; A x V 3 Effective horse ...
The following rules enable area , speed , and power of windmills to be calculated
: To find the horse - power developed by a windmill : V = velocity of wind in feet
per second ; A = total area of all the sails in square feet ; A x V 3 Effective horse ...
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adopted advantage amount apparatus arranged average boiler calculation cent CHAPTER chimney coal comparative compound condensation consideration construction cost Crown 8vo cubic feet cylinder diameter direct double driving dynamo economical effective horse-power efficiency electric employed engine equal exhaust fall figures fire foot force fuel furnace gallons give given grate head heat heating surface horizontal Horse hour Illustrations increased indicated horse-power iron known latter length less Load machine material Maximum means Minute motor naturally necessary obtained ordinary pipe plates portable practice pressure proper proportions pump quantity shaft single sizes space speed square inch steam Stroke suited supply taken tions tubes turbine turn unit usually valve vaporizer varies various vertical volts Watts weight wheel wide Woodcuts
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