# Electric Interlocking Handbook by the Engineering Staff of the General Railway Signal Company

General railway signal Company, 1915 - Railroads - 435 pages

### Popular passages

Page 219 - Cubic Measure 1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...
Page 219 - Metric Measures The metric unit of length is the meter = 39.37 inches. The metric unit of weight is the gram = 15.432 grains. The following prefixes are used for sub-divisions and multiples: Milli = iVsir.
Page 219 - SQUARE MEASURE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet — 1 square yard (sq.
Page 193 - The tops of bridge seats, pedestals, copings, wing walls, etc., when not finished with natural stone coping, shall be finished with a smooth surface composed of one part cement to two parts of granite, or other suitable screenings or sand, applied in a layer one-half (j^) to one (l) in.
Page 193 - About one inch of mortar (not grout) of the same proportions as used in the concrete may be placed next to the forms immediately in advance of the concrete.
Page 91 - ... and continued at the same rate until both the specific gravity and voltage show no rise over a period of ten hours, and gas is being freely given off from all the plates.
Page 211 - Many writers give as a safe practice for single belts in good condition a working tension of 45 pounds per inch of width, which formula gives a permissible increase in transmitted horse power of 50 per cent. over the formula wxdx rpm 3820 For "double...
Page 192 - Spread the sand evenly upon the platform, then the cement upon the sand, and mix thoroughly until of an even color. Add all the water necessary to make a thin mortar and spread again; add the gravel If used, and finally the broken stone, both of which, :f dry, should first be thoroughly wet down. Turn the mass with shovels or hoes until thoroughly incorporated and all the gravel and stone Is covered with mortar; this will probably require the mass to be turned four times.
Page 192 - Where necessary, forms shall be well built, substantial and unyielding, properly braced, or tied together by means of wire or rods, and shall conform to lines given.
Page 199 - STOP. A yellow light shall be the night indication for CAUTION, and a green light the night indication for PROCEED.