242
MOLESWOBTH'ö POCKET-BOOK
Roads.
Ordinary English turnpike-roads, 30 feet wide,
the centre 6 inches higher than the sides.
4 leet from the centre, J inch, below the centre.
9 feet from the centre, 2 inches „ ,,
15 feet from the centre, 6 ,,
Footpaths 6 feet wide, inclined 1 iuch towards
the road.
Side drains, 3 feet below the surface of the road.
Road material: bottom layer, gravel, burnt clay,
or chalk, 8 inches deep. Top layer, broken granite
not larger than inch cube, 6 inches deep.
Some use a 2J-inch ring to clear all angles of
the cubes for bottom metal, and a 2-inch ring for
top metal.
Footpaths: fine gravel, or aifted quarry chip-
pings, 3 inches thick.
Gauging Road-metalling.
Heaped on the side oi the road ready for laying.
L = Length of
aide of gauge
in inches.
B = Number of
Bushels re-
quired per lin
jard of road.
L = 12| V B.
The heaped bushel being reckoned at 2700 c. ins.
L =s 17 kJ C when C = the number of ‘‘cubes”
per “ line.”
A “cube” being = 100 cubic feet.
A “line” „ = 100 lineal feet.
. Wear of Roads in India
is reckoned at 1 cubic yard of metal per mile for each
cart that passed as a daily average over the road.