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Electricity |
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Absolute Electrometer "Thomson's absolute electrometer is an adaptation of the attracted disc principle for absolute determinations. We give merely an indication of its different parts, referring to Thomson a paper for de... |
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Alternator "The alternator is a dynamo designed for the generation of alternating currents. It has collecting rings instead of a communtator so that the current is delivered just as it is generated, and a small ... |
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Ammeter A meter used to test batteries.... |
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Ammeter, Hot-wire "Hot-wire instruments working on the sag principle can be used in any position if properly contructed, and are very portable." —Encyclopedia Britannica, 1910... |
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Ammeter, Shunted Movable Coil "A much better form of electromagnetic ammeter can be constructed on a principle now extensively employed, which consists in pivoting in the strong field of a permanent magnet a small coil through whi... |
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Ampere Balance, Lord Kelvin's "When a current is passed through the instrument it causes one end of the movable system to tilt downwards, and the other end upwards; the sliding weight is then moved along the tray by means of a sil... |
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Ampere-meter "An instrument for measuring the strength of an electric current in amperes."-Whitney, 1902... |
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Arbor of Incandescent Lamp "The incandescent lamp, which is used chiefly for house lighting, consists of a glass bulb from which the air has been exhausted by pumps and chemical processes-- in which there is a thin filament of ... |
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Arc lamp "In all the arc lamps in common use, the coil, by means of which the automatic maintenance of the arc is kept up, is placed as a shunt across the its poles."—Finley, 1917... |
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Arc lamp "The arc lamp is essentially a device for automatically separating the carbons when the current is turned on, for 'feeding' the carbons together as they are burned away at their tips, and, in some cas... |
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Arc lamp, detail "Illustration showing the detail of a carbon arc lamp; S, solenoid; c, clutch; w, clutch-washer; T, electromagnet; m, short circuit point; R, resistance properly adjusted." -Avery 1895... |
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Arc lamp, differential "Differential arc lamp mechanism." —Croft 1917... |
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Arc lamp, metallic flame "Metallic flame arc lamp." —Croft 1917... |
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Arc lamp, multiple series "Circuits of a multiple series lamp." —Croft 1917... |
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Arc lamp, series "Since arc lamps are connected in series, any particular lamp that is to be extinguished must be short-circuited. The dynamo is provided with appliances for maintaining a uniform current strength rega... |
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Arc lamp, series circuit "Circuits of a series arc lamp." —Croft 1917... |
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Arc lamp, series coil "Arc lamp mechanism with series regulating coil." —Croft 1917... |
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Arc lamp, shunt coil "Arc lamp mechanism with shunt regulating coil." —Croft 1917... |
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Arc Light An arc lamp or arc light is the general term for a class of lamps that produce light by an electric arc (also called a voltaic arc). The lamp consists of two electrodes typically made of tungsten whic... |
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Arc lighting, carbon Arc lighting, which used two carbon rods conducting electricity to produce light. -Atkinson 1903... |
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Armature, drum "The drum armature differs from the shuttle armature chiefly in that it employs many coils instead of one. The cylindrical iron core is made of thin disks of soft iron in insulated from each other, t... |
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Armature, Gramme ring "Gramme ring armature with six coils." — Hawkins, 1917... |
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Armature, ring "Ring armature of four pole dynamo; diagram of winding and connections, showing direction of the indced currents. the currents in the winding under the upper N and S poles are opposed to each other an... |
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Armature, Siemens "Consists of a coil of wire wound in two broad grooves plowed on opposite sides of an iron cylinder." — Avery, 1895... |
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Arrangement of Battery, Resistance, and Galvanometer "Represents in diagram the arrangement of the battery, resistance, and galvanometer. There are two keys, K and K, , placed in the circuit whose uses will be subsequently explained for the present, th... |
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