The hammer consists of a roughly squared beam,
4 meters in length, and of 0.25 m. section. The head, A, consists of a
mass of iron weighing 150 kilos, including the weight of the straps
that surround the beam on every side of the piece of iron. The axis of
rotation is situated at the other extremity of the beam, B. The cam
shaft which serves to maneuver the trip hammer is provided with four
cams which lift the beam at a point near the hammer. The length of this
shaft (to the extremity of which is adapted the water wheel) is 4.75 m.,
and its diameter is 0.50 m. The wheel is an _overshot_ one, 3.25 m. in
diameter by 1 m. in width. The water, which is led to it by a flume,
acts upon it by its weight and impact, and is retained in the buckets
and kept from overshooting the mark by a jacket made of planks.
[Illustration: FIG. 4.--THE TRIP HAMMER.]
The anvil upon which the hammer strikes is surrounded by a bed of stones
(quartzites) derived from the neighboring rocks. It is a mass of iron,
75 kilogrammes in weight.
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