. The Street railway journal . he frictional resistance of the entering air, and fur-nishes at the same time a rigid support for the motor, to which itis attached by the tripod hanger. These fans are built in sizes from 18 ins. to 120 ins., with motor;designed for either medium or maximum speed, and to run at anyordinary direct current voltage. A speed controller is always pro-vided, by means of which the fan can be efficiently operated atdifferent speeds. June, 1899.] STREET RAILWAY JOURNAL. 411 Standard Portable Meter A new portable standard electrical measuring instrument, fordirect current
. The Street railway journal . he frictional resistance of the entering air, and fur-nishes at the same time a rigid support for the motor, to which itis attached by the tripod hanger. These fans are built in sizes from 18 ins. to 120 ins., with motor;designed for either medium or maximum speed, and to run at anyordinary direct current voltage. A speed controller is always pro-vided, by means of which the fan can be efficiently operated atdifferent speeds. June, 1899.] STREET RAILWAY JOURNAL. 411 Standard Portable Meter A new portable standard electrical measuring instrument, fordirect current only, is being placed upon the market by the Mc-intosh Battery & Optical Company, Chicago, and is shown here-with. Its construction is exceedingly rigid, fitting it to withstandthe rough usage to which portable instruments are frequentlysubjected. This meter is of the dArsonval pattern, having a coilmoving in the field of a permanent magnet. It has uniformlyspaced scale divisions and an adjustable dial, so that should the. PORTABLE AMMETER index become bent it is but the work of a moment to set it tozero. The instrument is dead beat. The permanent magnets are made from imported magnet steel,and are thoroughly aged before being placed in the springs are made from a special low-resistance phosphor-bronze alloy, and are of a very fine temper. The series coils inthe volt meters and the shunts of the ampere meters are madefrom an alloy having a zero temperature coefficient. A neat hardwood carrying case is provided with each volt meters have a resistance of about 120 ohms per volt ofscale; i. e., a 0-150 volt meter has a resistance of 18,000 ohms. New Open Cars for Brooklyn The Brooklyn Heights Railroad Company, of Brooklyn, N. Y.,is now putting in service a large number of thirteen-bench, bulk-head open cars, which, on account of the careful way in which the height from the head of the rail to the underside of the sill is 25ins. The height over all is 8 ft
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
