417 OF ENGINEERING FORMULÆ.
Transmission of Power by Wire Rope. (Roebling.)
1. Power may be transmitted economically by round
endless wire ropes to a distance of 3 milee. >> '
2. Wire rope transmission costs J-th the amount of belting,
and A th that of shafting.
3. The range of rope is from t to J
inch diameter.
4. The ropes should be made with
a hempen core to increase pliability.
5. It is not necessary that the two
wheels should be atthe same height.
6. The deflection of the lower rope
when working is one-half greater than
the rope at rest, or about A.th of the
distance from wheel to wheel.
7. The lower rope should be made
the pulling rope.
8. The groove in the wheels should
fee formed as shown in the accotfi-
»anying diagram, the wire rope resting „„ , , - „
On a filling of either soft wood, India- S „J™ °'1?1;Kn'HEK?
Rubber, or oakum. The recess should 01
be dovetailed to prevent the filling from cording out. •
j 9. A. little hot coal-tar occasionally poured into tile groove
is a good lubricant.
Transmission or Power bt Wirb Rope.
D Diameter of pulley In feet.
R — Revolutions of ditto per minute.
d — Diameter of rope in Inches. HP = Horse-powér. .
! DJ __ 4 S 6 1
R 80 100 120 140 80 100 120 140 80 100!120(149
d I f J f JL. 7 1 7 IS 1 16 : 7 । 16 15 H. it Hl
HP 3-3 4-1 i 5 5-8 6-9 8-6 ÜQ-3 12'1 10-7 13-.4 IG-l'lS-lf
D 1 . 1 8 ~’
R 80 I 100 1 120 140 80 100 I 120 140 80 1001120 I 140
d i i i * $ 1 i 4 4 r « 4 51-9’62’2 72-6
HP 16-9 21-l|25-3 29-6 27'5 33 38-5 41-5
D 10 12 14 15
R d HP 100 73 120 87-6 140 102-2 100 t 124-1 120 4 148-9 140 f 173-7 100 I 176 120 I 211 100 i 259 120 i 300
2 E