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11o volts advantages advertising alternating current amperes apparatus appliances arc lamps armature average battery Belted blowers candle power carbon cent central station service charge chine Cigar lighters circuit Coffee percolators coils color connected consumed consumption cutter cutting devices direct current drill drive drum sander economical efficiency electric energy electric heating electric lamp electric light electric motor electric sign electrodes expense factory Fans filament Flatiron full load gas engine Glue pots Group Group Group Indiv horse horsepower Horsepower required illumination incandescent lamps installation kilowatt-hour lathes Load factor machinery manufacture mercury metal necessary Nernst lamp number of lamps obtained placed planer plates prospective customer Radiators rheostat Rip Saw Root blowers running Service Required Hp shafting shunt Soldering irons solicitor speed steel switch Table temperature tool tube vapor vehicle ventilation voltage watts watts per candle wiring
Page 266 - The volt, which has the value 10s in terms of the centimetre, the gramme, and the second of time, being the electrical pressure that if steadily applied to a conductor whose resistance is one ohm will produce a current of one ampere, and which is represented by -6974 (•}•$$) of the electrical pressure at a temperature of 15° C.
Page 43 - ... or place of public assembly or entertainment, shall have in continuous operation while occupied a system of ventilation so contrived as to provide fifty cubic feet per minute of outer air for each light other than an electric light and for each occupant.
Page 113 - ... should lend a distinguishing air of quality to a shop, and it is this element which gives it its greatest value. While a sign will designate a place of business, and perhaps the nature of that business, a large part of its value lies in the impression it makes. Hence only the best and most permanent types of sign should be adopted, no matter how small they must be to meet the price the customer can afford to pay for them.
Page 250 - ... to low cells, do not delay in locating and bringing them back to condition. 12. Do not allow sediment to get up to the plates. Mercury Arc Rectifier. — This is a device for obtaining direct current from alternating for use in charging storage batteries. This transformation of current is obtained at a low cost, because the regulation is obtained from the alternating side of the rectifier, while the current comes from the direct current side. The theory is as follows : In an exhausted tube having...
Page 251 - ... current towards the cathode, thence through the load and back to the opposite side of the supply through a reactance. At each reversal the reactances discharge, thus maintaining the arc until the voltage reaches the value required to maintain the current against the counter EMF of the load, and also reducing the fluctuations in the direct current.
Page 250 - In an exhausted tube having one or more mercury electrodes, ionized vapor is supplied by the negative electrode or cathode, when the latter is in a state of "excitation." This condition of excitation can be kept up only as long as there is current flowing towards the negative electrode. If the direction of the voltage...
Page 249 - A battery must always be charged with "direct" current and in the right direction. STORAGE STORAGE 2. Be careful to charge at the proper rates and to give the right amount of charge; do not undercharge or overcharge to an excessive degree. 3.
Page 43 - Every hall, auditorium or room of every building hereafter erected for or converted to use as a schoolhouse, factory, theatre or place of public assembly or entertainment shall have in continuous operation while occupied a system of ventilation so contrived as to provide fifty cubic feet per minute of outer air for each light other than an electric light for each occupant.
Page 248 - In treating the battery as above it was charged four times oftener than necessary, and then did not make the mileage it was capable of on one full charge. In other words, when a vehicle is in daily use for short runs money is saved on the current bill and the life of the plates is prolonged if the battery is not charged until 75 per cent of its...