Electrical Engineering Testing: A Practical Work for Second and Third Year Students, Engineers and OthersChapman and Hall, Limited, 1907 - 554 стор. |
Загальні терміни та фрази
abscissæ accurate adjust alternating current ammeter amperes Amps angle Apparatus armature balance battery brake cable calibrated cell centre circuit Clark cell connected constant convenient copper copper losses curve deflection diagram direct current dynamo dynamometer efficiency electrical engine equal error exciting current fixed frequency full load galvanometer give indicator inductive instrument insulation resistance joint lamp Leclanché cells light losses low resistance machine magnetic maximum means measured meter method motor movable moving coil needle non-inductive note the readings obtained ohms ordinates Oscillograph output phase plates Plot pointer position potential potentiometer power factor pressure pulley R₁ R₂ Repeat rheostat rotor S₁ scale screws secondary self-induction shown in Fig shunt slide solder speed standard stator supply switch tabulate your results temperature tension terminals transformer turns V₁ V₂ voltage voltmeter volts W₁ Wattmeter Watts weight Wheatstone Bridge wire zero
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Сторінка 322 - Then insert the cork and zinc rod, passing the glass tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly all expelled, and the cell should be left in this condition for at least twenty-four hours before sealing, which should be done as follows.
Сторінка 552 - Pocketbook. Of mensuration, trigonometry, surveying, hydraulics, hydrostatics, instruments and their adjustments, strength of materials, masonry, principles of wooden and iron roof and bridge trusses, stone bridges and culverts, trestles, pillars, suspension bridges, dams, railroads, turnouts, turning platforms, water stations, cost of earthwork, foundations, retaining walls, etc.
Сторінка 320 - Prepare a neutral saturated solution of pure ("pure recrystallised ") zinc sulphate by mixing in a flask distilled water with nearly twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent, by weight of the zinc sulphate crystals to neutralise any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C.
Сторінка 321 - O'5 cm. thick to fit the tube ; at one side of the cork bore a hole through which the zinc rod can pass tightly ; at the other side bore another hole for the glass tube which covers the platinum wire ; at the edge of the cork cut a nick through which the air can pass when the cork is pushed into the tube.
Сторінка 321 - ... taking care that the whole of the exposed platinum is covered. Shake up the paste and introduce it without contact with the upper part of the walls of the test tube, filling the tube above the mercury to a depth of rather more than 1 centimetre.
Сторінка 428 - ... of the top plate of system A ; but when the instrument is packed for carriage they are screwed down against the plate until the conical nuts mentioned above are drawn up into the conical holes in the top and bottom plates of system A ; system B is thus raised off the glass pillars, and the two systems are securely locked together so as to prevent damage to the instrument. A dust-tight cylindrical metal case, h, which can be easily taken off for inspection, covers the two systems and fits on to...
Сторінка 358 - The slipping of the weight into its proper position is performed by means of a self-releasing pendant, hanging from a hook carried by a sliding platform, which is pulled in the two directions by two silk threads passing through holes to the outside of the glass case.
Сторінка 427 - B rests by means of the well-known "hole, slot, and plane arrangement*," engraved on the under side of its bottom plate, on three upwardly projecting glass columns which are attached to three metal screws working through the sole plate of system A. These screws can be raised or lowered at pleasure, and by means of a gauge the plates of system B can be adjusted to exactly midway between, and parallel to, the plates of system A. The complete leyden stands upon three vulcanite feet attached to the lower...
Сторінка 360 - Cylindrical counterpoise weights with a cross-bar passed through them are supplied for the purpose of balancing the sliding weights when they are placed at the zero of the scale. The sliding weight should be placed so that the index of the carriage points to the zero of the scale, and the proper counterpoise weight should be placed in the trough, fixed to the right-hand end of the beam, with its crossbar passing through the hole in the bottom of the trough. The flag which is attached to the...
Сторінка 517 - M is received on a screen or photographic plate, the instantaneous value of the current being proportional to the linear displacement of the spot of light so formed. With alternating currents the spot of light oscillates to and fro as the current varies and would thus trace a straight line.