Science and Industry, Հատոր 7Colliery Engineer Company, 1902 |
From inside the book
Արդյունքներ 99–ի 1-ից 5-ը:
Էջ 2
... less frictional resistance does it oppose to motion over another body . However smooth it is made to appear , a microscopic exam- ination will reveal a state of roughness but with the inequalities becoming smaller and smaller as the ...
... less frictional resistance does it oppose to motion over another body . However smooth it is made to appear , a microscopic exam- ination will reveal a state of roughness but with the inequalities becoming smaller and smaller as the ...
Էջ 3
... less , because then A will simply ride along on B without any rising and falling ; there will be a resistance , though , owing to the fact that the bearing surface consists of narrow sharp edges , which will , granted suf- ficient ...
... less , because then A will simply ride along on B without any rising and falling ; there will be a resistance , though , owing to the fact that the bearing surface consists of narrow sharp edges , which will , granted suf- ficient ...
Էջ 5
... less than when just starting , because during the preceding state of rest , the lubricant - especially if pos- sessing but little oiliness - will have been more or less thoroughly squeezed out , thus bringing about more nearly a ...
... less than when just starting , because during the preceding state of rest , the lubricant - especially if pos- sessing but little oiliness - will have been more or less thoroughly squeezed out , thus bringing about more nearly a ...
Էջ 6
... less than in oil , and such is actually the case . The ordinary textbook experiment is to suspend a hollow cylinder inside a vessel filled with water ; if the supporting wire be twisted through a certain angle and then released , the ...
... less than in oil , and such is actually the case . The ordinary textbook experiment is to suspend a hollow cylinder inside a vessel filled with water ; if the supporting wire be twisted through a certain angle and then released , the ...
Էջ 12
... less than 20 amperes . The resistance of the coil in ohms , or the ohmic resistance as it is sometimes called , has not been changed in any way , and the voltage applied is the same as before , but the current is less because the ...
... less than 20 amperes . The resistance of the coil in ohms , or the ohmic resistance as it is sometimes called , has not been changed in any way , and the voltage applied is the same as before , but the current is less because 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.