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188
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Molesworth’s pocket-book
SCALES FÖR PLANS DEPOSITEJD UNDER STANDING
ORDERS.
Minimum scale for plans) . . ,
and sections .. .. J ~ * menes to the mile.
Ditto, vertical ditto, for) ,An x ,
sections . r — 1Q0 feet to th.G inch..
Minimum scale for en-
larged plans of build- = 6 chains to the inch.
ings, &c. __________
Minimum scale for «ross-
sections, and sections ■ = 40 feet to the inch,
of road alterations ..
Boaep of Trade Regulations fob Railways.
MAIN LINE.
Breaking weight of cast-iron girders to be made
- permanent load X 3 + moving load x 6.
Wrought-iron bridges must not be strained to
more than 5 tons per square inch when loaded
with the heaviest engines.
Minimum distance of standing work from the
outer edge of rail at level of carriage steps.
= 3 feet 6 inches in England.
=s 4 feet m Ireland.
Minimum distance between lines of railways
= 6 feet. J
STATIONS.
Minimum width of platform = 6 feet; 12 feet at
important stations.
Minimum distance of column from edge of plat-
form = 6 feet.
Steepest gradient recommended for stations
= 1 in 260.