Vol. LXIV, No. Io.]

ENGINEERING JOURNAL.

445

Domene, we enter a narrow gorge, the rocky walls of
which rise at different points 2oo m. (656 ft.) above the
current. On the banks of this stream stand some paper-
mills which are run by water power, the power being de-
rived from a [all 180 In. (590.4 ft.) in height at some dis-
tance above, from which it is necessary to carry the water
about 2 km. through a canal to reach the turbine wheels.
Above this gorge, and close to the stream, there is a lit-
tle hamlet, known as Eaux-de-Revel, which is 5 km. from
Domene by the course of the stream. This is at the foot
of a fall which has been used for motive power, and at this
point have been established the turbine wheels and the
generating dynamo which transforms water power into
electric energy. Above this point the Domenon, for a
considerable distance, has an average fall of I in 10, and
at the bridge of Cornets, where the water is taken, the
level is 70 m. (229.6 ft.) above the power-house, to which it
is conveyed by a wrought-iron pipe having a total length
of 700 m. (2,296 ft.). It was necessary to give this pipe a
foundation sufficiently solid to prevent it from being dis-
turbed by the frequent floods. The present arrangement
is_only temporary, and when more power is needed water
will be taken from a point which will give a total fall of
I30 in. (426.4 ft.) to the power-house. Above this point
there are two small hamlets and several houses, and upon
the right bank there comes in an important tributary
stream, the Dhuys, which is fed by a considerable rocky
water-shed, and which brings to the Domenon a supply
without which the water in winter would be too low to
supply the necessary power. A little further up, upon the
opposite bank, there is also a small stream which flows
from Lake Robert, and which is fed somewhat irregularly

by the melting snows from the Petite Bodene. Above this
oint the mountain rises abruptly, and there are several
small falls ending in the Cascade of l'Oursiere, where at a

‘single leap the stream falls 60 in. (196.8 ft.), and in the

spring the flow of the stream is from 13 to 15 cubic meters
(458 to 530 cub ft.) per second. Above this cascade the
forest ceases and the mountain is rocky and desolate ; and
here are found the sources of the stream in several little
lakes where are gathered the waters derived from the
melting of the snows, and of a glacier which is found on
the southwestern slope of the mountain.

_ At the power-house, which has been named “ La Force,”
the generating dynamo, which is driven by a turbine with
a horizontal shaft, is ioined by two wires carried on poles,
which convey the power to the receiver at Moutier from
La Force. The line runs directly out some distance from
the stream to the village of Revel, whence it follows the
road well known to tourists who ascend the mountain.
The posts are set at the side of the road until they reach
the gorge before referred to, when they leave the road and
descend almost in a direct line with an inclination aver-
aging 60°, thus avoiding the numerous windings of the
road.

The general conditions of the working of this transmis-
sion are as follows : The generating dynamo has a maxi-
mum speed of 240 revolutions per minute and a maximum
power of 3oo H.P. The receiver has a maximum speed of
300 revolutions per minute and a maximum power of 2oo

H.P. The transmitting line is 5 km. (3.11 miles) in
length. The electro-motive power has a maximum of
2,850 volts and a maximum intensity of 70 amperes. The
electric result obtained, calculated after deducting all re-

'Fig. 2. _

sistances, is 83 per cent. of the total power, while the aver-
age mechanical result is 65 per cent.

Since it has been put in operation this transmission has
run steadily day and night. Although the running of the
machinery does not present any special difiiculty, it is
worthy of note that it is managed entirely by the same
persons who formerly ran the machinery with steam power,
but who, although they had no previous acquaintance with
the management of dynamos or electric motors, have had
no difficulty in operating these.

This installation was made by M. Hillairet, who de-
signed it, and who deserves much credit for its complete-
ness and the excellence of its arrangement.

In the accompanying illustrations, fig. I is a small map
showing the location of the transmission ; fig. 2 shows a
part of the pipe through which the water is conveyed to

the turbine, and fig. 3 is a view of the power-house at La
Force.

If this plan for transmission of power had not been
adopted, it would have been necessary to use steam power
for the paper-mill, since at the point at which the water
could be used there was no place at which mills of any size
could be erected, owing to. the rugged nature of the