Sleepers need not be less than 6 inches
apart. Fix the sleepers on the longitudinals before hammering the rails
into the slots.
[Illustration: FIG. 44.--Laying out a curve for electric track.]
Curves.--A simple method of laying out a semi-circular curve is shown in
Fig. 44. Sleepers and longitudinals are replaced by 1/2-inch boards, 8
inches wide. Three pieces, about 32 inches long each, have their ends
bevelled off at an angle of 60 degrees, and are laid with their ends
touching. Two semi-circles of 24 and 22 inch radius are drawn on the boards
to indicate the positions of the rails, and short decapitated brass nails
are driven in on each side of a rail, about an inch apart, as it is laid
along one of these lines. (See Fig. 44. A.) The inside nails must not
project sufficiently to catch the wheel flanges. The spring of the brass
will prevent the rail falling out of place, but to make sure, it should be
tied in with wire at a few points. The centre rail should on the curves
also be 3/8 inch deep, and raised slightly above the bed so as to project
above the wheel rails. The method already described of bonding at joints
will serve equally well on curves.
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