. Electric railway journal . or on the outside of the box. Two U-shapedslides are soldered to the box to hold the door in door is made from a piece of tin or iron and hasa small loop soldered thereto for convenient door gives access to the box when it is necessaryto replace the lamp. The number strips are made of painters white mus-lin placed against a black background. These num-bers run from 1 to 9 and 0. One strip is furnishedwith an E to designate extra trains. All strips are alsoprovided with a black blank to be used when fewer thanthree numbers are needed. These nu
. Electric railway journal . or on the outside of the box. Two U-shapedslides are soldered to the box to hold the door in door is made from a piece of tin or iron and hasa small loop soldered thereto for convenient door gives access to the box when it is necessaryto replace the lamp. The number strips are made of painters white mus-lin placed against a black background. These num-bers run from 1 to 9 and 0. One strip is furnishedwith an E to designate extra trains. All strips are alsoprovided with a black blank to be used when fewer thanthree numbers are needed. These number strips areglued at the ends to V-j-in. x 6-in. wooden rolls. Theserolls have a Mt-in. hole through the center throughwhich the operating rod passes. For such operatingrods we use trip rods from GE ML-2 , a piece of aA-in. round iron will answer thepurpose if provided with some sort of a knob withwhich to turn it. The rods pass through the smallholes shown in the sketch and through the hole in the. PATTERN FOR CUTTING OUT TRAINNUMBER BOX wooden rolls. They are held firmly in the rolls byfriction. The boxes are placed in the center front windowof the car and are supported by iron or brass brackets 2 1 9 TRAIN NUMBER BOX screwed to the sash. In wiring, enough slack is leftso that the motorman can lift the box out of the brack-ets while changing the numbers. The light can bewired either in series with one of the car circuits orwith the marker and classification light circuit. Voltmeter Measurements of DirectCurrent BY G. H. MCKELWAY, DISTRIBUTION ENGINEER BROOKLYNRAPID TRANSIT SYSTEM Practically all engineers are familiar with the use ofa voltmeter for determining current in a wire fromvoltage drop, but few of them have tables that will givethem quickly and easily a statement of the amount ofcurrent in the wire causing the drop found. Generally,after the measurement has been made, it is necessary tolook up in a table the resistance per 1000 ft. of the s
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