The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1902-04-21
THE EN- HOLM ELECTRIC CLOCK
is Made to Run for More Than Three
Years without Winding.

During the latter part of the nineteenth
century electricity has been applied in
many ways to many things; but one of
the most radical changes which it has
ever made. of any description, seems Is
nave taken place in clock making Until
this year clocks were constructed on
practically the same principles as those
Of lG0 years age. Even the clocks in
ofilces and factories synchronizcd by W
-: IeIegraph wires are run by a spring
alId PG1dulun, and wound regularly The
En- Holm clock, however, invented ana
patented by Oscar A. En- Holm, and manu-
1acture ca, by the Commercial Electric
lime Company of America Homer w
61edge, President, with offices at 129
Broadway, New York, is a radical de-
parture from any form of clock now on
the market
The application Of electricity is in sup
plying motive power in the place of the
usual spring. In the base of the clock
concealed from view, are two sealed bar
terleS whose capacity is 10 ampere hours
IN the place of the spring, and running
through the center of an electrOmagnef
or sOlenoid is an armature in the form If
d rOd composed Of a magnetic material
rms core is suspended from a lever
winch IS connected to the gear train Nv
means OF a small ball clutch guided BY
standards. The clock starts with the
core or armature at its highest point its
own weight carries it downward: and
as it descends it pulls down the lever
with 1t, which has a sliding motion In
surfing uniform driving power, thus Civ
ing the driving power to the regular ma
cflnery OF the CLOCK
Inc circuit OF the magnetic or solenoid
coil is completed by the switch shown
above and to the right of the core 1t IS
composed of a glass bulb attached to a
pivot and moved by the armature weight
in one end of which are the two wires not
connected. In the bulb also is a small
quantity of mercury; and in it's ordinary
position the wires are at the top and the
mercury at the bottom. When the core
reaches the lowest point in its descent If
tips the bulb with which it is connected)
until the end with the two wires is the
lower. The mercury completes the cir
curt, the electromagnetic raises the core to
it's original height, and the bulb assumes
its upright position again, thus discon-
meeting the circuit. By another ingenious
device the driving power of the core is
not stopped while it is being raised
There is nothing to wear in the mechan-
mum.
The weight takes FIVE ana traction
minutes to make the descent, and the
amount of time necessary for the cleo
tricity to lift it is less than 1-3 Of a sec
end. The capacity Of the batteries, as
stated above, is 10 ampere hours or
36, 900 600 millampere seconds. Every five
and a half minutes the clock requires
ondS. AS the electricity is only in use
during the 1-3 of a second in which the
core is being raised, it follows, therefore,
that the batteries contain enough cleo
tricity to run the clock for more than
5000 days The makers only guarantee is
for three years, however
One important point in favor of this
clock is that as 1t has no pendulum or
of a perfectly horizontal base, and helps
to assure correct time.
This extraordinary clock will cost no
more than the Sprlng-driven clock in the
various styles of cases, for all purposes
where accurate time is required.