Science and Industry, Հատոր 7Colliery Engineer Company, 1902 |
From inside the book
Արդյունքներ 100–ի 1-ից 5-ը:
Էջ 20
... shown at its extreme throw in both directions . The full lines show its position with an average load . When the upper crank travels from 1 to 2 it represents the engine crank on the second quarter , during which the crosshead travels ...
... shown at its extreme throw in both directions . The full lines show its position with an average load . When the upper crank travels from 1 to 2 it represents the engine crank on the second quarter , during which the crosshead travels ...
Էջ 21
... shown . The distance from this line to the end of B should be just one - half of the diameter of the shaft . The sticks should be turned up out of the way and left where they are , so that the alinement may be tested at any time ...
... shown . The distance from this line to the end of B should be just one - half of the diameter of the shaft . The sticks should be turned up out of the way and left where they are , so that the alinement may be tested at any time ...
Էջ 30
... shown by the dotted lines in the same figure . It will now be noticed that the dis- tance , or more correctly , the angle included between the eccentric cen- ters c c , shown in Fig . 3 , is greater than that indicated in Fig . 6 ...
... shown by the dotted lines in the same figure . It will now be noticed that the dis- tance , or more correctly , the angle included between the eccentric cen- ters c c , shown in Fig . 3 , is greater than that indicated in Fig . 6 ...
Էջ 31
... shown at i . We now have between the points of the compasses the true length of the eccen- tric rod . Most engineers know that the working or true length of the connecting rod is measured between This will the circle efg , as shown ...
... shown at i . We now have between the points of the compasses the true length of the eccen- tric rod . Most engineers know that the working or true length of the connecting rod is measured between This will the circle efg , as shown ...
Էջ 32
... shown , when making the measurements referred to . If the stroke of the valve is assumed to be twice that of the pin q , then , when setting the compasses , only one - half of the lap , plus the lead , must be meas- ured off from the ...
... shown , when making the measurements referred to . If the stroke of the valve is assumed to be twice that of the pin q , then , when setting the compasses , only one - half of the lap , plus the lead , must be meas- ured off from 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 combustion condenser connected copper crosshead cut-off cylinder diagram diameter direct current direction distance dynamo efficiency electric electromotive force equal feedwater feet field fire force formula friction fuel furnace give given grate heater heating surface holes horsepower increase insulation iron joint lamp length load machine machinery magnetic mean effective pressure means mechanical metal method motor necessary number of turns obtained ohms operation piece pipe piston plant plates position pounds practical pressure pulley pump resistance revolutions per minute rheostat SCIENCE AND INDUSTRY Scranton shaft shown in Fig shunt side speed square inch steam engine steel stroke 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.