. Factory and industrial management . r is read direct. This dynamometer canbe placed between the line shaft and any tool or machine with the great-est ease. The belt is taken off and hung up, and a short piece ofexperimental belting run from the driving pulley to the upper pulleyof the dynamometer. The lower pulley is then connected to thedriven machine by another belt, and the direction of rotation, as wellas the speed, is preserved. Fast and loose pulleys enable the wholeoperation to be completed in a very short time. The horse powerbeing determined, the size of the motor is fixed, and it r
. Factory and industrial management . r is read direct. This dynamometer canbe placed between the line shaft and any tool or machine with the great-est ease. The belt is taken off and hung up, and a short piece ofexperimental belting run from the driving pulley to the upper pulleyof the dynamometer. The lower pulley is then connected to thedriven machine by another belt, and the direction of rotation, as wellas the speed, is preserved. Fast and loose pulleys enable the wholeoperation to be completed in a very short time. The horse powerbeing determined, the size of the motor is fixed, and it remains onlyto show by what means these motors should be supplied with the several systems in use at the present time, the ordinarydirect-current shunt-wound motor has by far the widest making any comparisons, which are invidious, an ideal schemeis here sketched out, which could be applied to a large numberof mills and factories as at present arranged. In the first place^ ^42 ELECTRIC POWER IN SMALL A DIRECT-CONNECTED AIR-COMPRESSOR. nearly all modern manufacturing establishments are equipped withtheir own electric-light plants. These are sometimes supplementedwith an electric-power plant, but it is safe to say that in the futurethese conditions will be reversed, and the electric-light plant willsupplement the power plant. Better still, they will be combined inone, and the dynamos which serve as power-generators in the day-time will also furnish light during the dark afternoons and mornings. ELECTRIC POWER IN SMALL UNITS. 243 as well as provide lights constantly in the dark corners and out of-the-way locations. An eminently practical system of distribution appearsto be two-phase alternating currents at a potential of 220 volts. Thispressure is perfectly capable of easy control and insulation, and, at avery small outlay for copper, it is well adapted to extended distributionthroughout large establishments, even those covering considerablegroun
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