Railway Signaling and Communications Volume 3 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...do not include I as this might conflict in some place with 1. Each letter works as if it were a single die. The wheel is fastened to the shaft C by-'1 pin e which is driven through both parts. The screw With a cone-shaped point fits into the small holes f in the side of the wheel and holds the wheel in place while it is Calling-On Arm Clrcults. A gig or special tool which is exceedingly useful to the foreman, who is out with a gang and who is required to do any considerable amount of drilling in the field, is shown in Fig. 2. This tool is also useful at a signal shop where work is being prepared for the foreman and special operations have to be conducted according to his ideas and plans. The block is of two inch cast iron, and, after being properly planed and worked down, comprises three separate handy and effective devices for holding small articles while they are being drilled. The first device is a scheme for holding the two kinds of brass terminals, the small and large size, many thousands of which are used in signal work throughout the country. Two holes in a small terminal, and three in a large one, must be drilled and two in each must be tapped. Generally several hundred of the small ones are run through the drill successively, and are then put through the tapping operation. The same is the case with the large terminals. The Hat strip of hardened steel can be lifted up and swung around out of the way while the terminals are being placed in position in the block. The holes in this strip which serve to guide the drill, are made large enough to accommodate the taps, and the strip is hardened to prevent the holes from becoming worn. The holes drilled at each side of the small terminal enable the operator to remove it easily from the...