ple expedient of adding an
antifreezing chemical to the water--and operation was placed on a
year-round basis.

Today the two Fives-Lilles hydraulic systems remain in full use; and
visitors reach the Tower's summit by Edoux's elevator (fig. 41), which is
all that remains of the original installation.

BALANCE OF THE THREE ELEVATOR SYSTEMS

_The Otis System_

Negative effect

Weight of cabin: 23,900 lb. x sin 78 deg.9' (incline of upper run) 23,390 lb.
Live load: 40 persons @150 lb. = 6,000 x sin 78 deg.9' 5,872
------ -- 29,262 lb.

Positive effect

Counterweight: 55,000 x sin 54 deg.35' (incline of lower run)
------------------------------------------
3 (rope gear ratio) 14,940 lb.

Weight of piston and chariot: 33,060 x sin 54 deg.35'
------------------
12 (ratio) 2,245

Power: 156 p.s.i. x 1,134 sq. in. (piston area)
----------------------------------------
12 (ratio) 14,742 31,927 lb.

Excess to overcome friction 2,665 lb.

_The Roux, Combaluzier and Lepape System_

Negative effect

Weight of cabin: 14,100 x sin 54 deg.35' 11,500 lb.
Live load: 100 persons @150 lb. = 15,000 x sin 54 deg.35' 12,220
------ -- 23,720 lb.

Positive effect

Counterweight: 6,600 x sin 54 deg.35' 5,380

Power: 156 p.s.i. x 2 (pistons) x 1,341.5 sq. in. (piston area)
------------------------------------------
13 (ratio) 32,196 37,576 lb.
------ ----------
Excess to overcome friction 13,856 lb.

_The Edoux System_

Negative effect

Unbalanced weight of plungers (necessary to raise full
lower car and weight of cables on lower side) 42,330 lb.

Live load: 60 persons @150 lb. 9,000
------ -- 51,330 lb.

Positive effect

Po