Science and Industry, Հատոր 7Colliery Engineer Company, 1902 |
From inside the book
Արդյունքներ 62–ի 1-ից 5-ը:
Էջ 11
... closed an interesting order for three - Lundell split - pole- 500 K. W. engine type generators , with speed of 100 R. P. M. , and wound for 250 volts , to be direct connected to gas engines . These three generators of 500 K. W. capacity ...
... closed an interesting order for three - Lundell split - pole- 500 K. W. engine type generators , with speed of 100 R. P. M. , and wound for 250 volts , to be direct connected to gas engines . These three generators of 500 K. W. capacity ...
Էջ 19
... closed by the dashpot . As soon as this takes place stop the flywheel instantly and meas- ure the distance from 1 to the present position of the crosshead . Turn the engine to the outside center and continue turning it very slowly until ...
... closed by the dashpot . As soon as this takes place stop the flywheel instantly and meas- ure the distance from 1 to the present position of the crosshead . Turn the engine to the outside center and continue turning it very slowly until ...
Էջ 38
... closed ; then H is moved to the right . When H comes in contact with button b , ( Fig . 1 ) , the armature and field circuits are both FIG . 3 Lines closed and current , therefore , flows through them . But to get to the arma- ture the ...
... closed ; then H is moved to the right . When H comes in contact with button b , ( Fig . 1 ) , the armature and field circuits are both FIG . 3 Lines closed and current , therefore , flows through them . But to get to the arma- ture the ...
Էջ 39
... closed be- cause , as shown in Fig . 1 , the coils of the starting box magnet are connected in series with the armature circuit . break in the field circuit would cause the counter E. M. F. to disappear and this would permit an ...
... closed be- cause , as shown in Fig . 1 , the coils of the starting box magnet are connected in series with the armature circuit . break in the field circuit would cause the counter E. M. F. to disappear and this would permit an ...
Էջ 40
... closed by means of two little bronze fingers ff which scrape against two little brass posts p p . The retaining magnet is thus demagnetized and the lever flies back , gradually inserting all the resist- ance and finally opening the ...
... closed by means of two little bronze fingers ff which scrape against two little brass posts p p . The retaining magnet is thus demagnetized and the lever flies back , gradually inserting all the resist- ance and finally opening the ...
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Common terms and phrases
alternating current amount ampere-turns amperes angle armature battery belt binding post boiler brass carbon cent circuit circular mils coal coil condenser connected copper crosshead cut-off cylinder diagram diameter direct current direction distance dynamo efficiency electric electromotive force engine equal feedwater feet field fire flow force formula friction fuel furnace give given grate heater heating surface holes horsepower increase iron joint lamp length load machine machinery magnetic mean effective pressure means mechanical metal method motor necessary number of turns obtained ohms operation pipe piston plant plates pounds practical pressure pulley pump resistance revolutions per minute rheostat SCIENCE AND INDUSTRY Scranton shaft shown in Fig shunt side speed square inch steam steam engine steel stroke superheated switch tank temperature tion tubes turbine valve voltage voltmeter volts weight wheel winding wire
Սիրված հատվածներ
Էջ 632 - AH a unit of resistance, the international ohm, which is based upon the ohm equal to 109 units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Էջ 455 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it is compelled by force to change that state.
Էջ 512 - Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
Էջ 258 - Bushings must be long enough to bush the entire length of the hole in one continuous piece, or else the hole must first be bushed by a continuous waterproof tube.
Էջ 240 - In the history of mechanical art two modes of progress may be distinguished — the empirical and the scientific. Not the practical and the theoretic, for that distinction is fallacious : all real progress in mechanical art, whether theoretical or not, must be practical. The true distinction is this : that the empirical mode of progress is purely and simply practical ; the scientific mode of progress ia at once practical and theoretic.
Էջ 258 - Must be placed on all service wires, either overhead or underground, as near as possible to the point where they enter the building and inside the walls, and arranged to cut off the entire current from the building.
Էջ 141 - L = length of stroke, in feet; A = area of piston, in square inches; N = number of strokes per minute = number of revolutions x 2. PLAN " " " 33,000 ' The derivation of this formula is explained, as follows: The area of the piston, in square inches, multiplied by the mean effective pressure, in pounds per square inch, gives the total force acting on the piston, in pounds.
Էջ 258 - No. 51.) a. Must be placed on all service wires, either overhead or underground in a readily accessible place, as near as possible to the point where the wires enter the building, and arranged to cut off the entire current.
Էջ 258 - In all wiring special attention must be paid to the mechanical execution of the work. Careful and neat running, connecting, soldering, taping of conductors and securing and attaching of fittings, are specially conducive to security and efficiency, and will be strongly insisted on.