The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1893-09-08

sity of about 80, 900 to 1O0, 900 candles, the
reflected beam a total luminous intensity
of about 375, 600, 900 candles, an intensity
which the eye cannot appreciate In
| looking at the side OF the beam the spec
tator only distinguishes stream Of light
of comparatively low intensity, but in
looking at the beam directly its brilliancy
is fully seen and the effect is absolutely
binding. Ventilators at the top and
sides allow a constant current of air to
pass through the drum and dissipate the
heat generated by the arc lamp; and they
are so arranged that no light can escape
through them. Ali the connections for
adjusting the positions of the carbons
and the lamp are brought through the
drum to the outside, and are arranged in
close proximity to one another at one side
SO that all may be manipulated by the
operator without moving from his posi-
, ton.
Through openings In the drum covered
by densely coiored glass the operation of
the lamp may be watched, and its adjust
ments verified. The drum is supported
by trunions in bearings at the top OF the
Y-shaDed fork, set in a base plate, and
the whole supported on system of fric-
ton wheels, forming turntable resting
upon the top of a massive pedestal sup
porting the whole structure. The drum.
fork and base plate may be rotated hori-
zontally en- the turntable either by hand
or by gearing provided for this purpose.
The drum may also be elevated or de-
pressed in a vertical plane by similar
gearing.
Before the protector was sent to the
Worlds fair a public test was made at
Middletown, Conn. From the roof OF the
works the great white beam of light shot
forth into the obscurity of the night and
slowly swept the countryside for miles
around, bringing every object upon which
it was directed into brilliant and distinct
relief. 1t Illuminated the roofs of distant
villages and scared their inhabitants and
lighted up the sign boards miles away so
that they could easily be read by means
of glass. The protector was turned up
ward towards the sky, and the beam, like
a supernatural divine finger, wrote words
upon the clouds-messages of light to the
starry populations. 1t was a majestic
manifestation of mans invasion OF the
realm of Phebus.
1t was observed that the space within
the beam was violently aa.itated, and
closer observation revealed the fact that
millions of moths and minute insects
were lowering in it, attracted by the
brilliancy of the light. Next morning
bushels of dead moths, beetles, other
insects, and some small birds, were swept
up from the roof on which the protector
stood. They had been killed by the in
tensity of the light.
How far the powerful beam of light of
this instrument can be see is difficult to
state. The search light set up by the
General Electric company on Mt. Wash
ington in the White mountains, has a
diameter of only thirty inches, and re-
flected light from the mirror of about
100. 900 candle power, yet the newspaper
can be read in its beam ten miles away,
and the light can be seen from points 100
miles away. How much farther then
could this 375, 600, 600 candle power light
be seen in clear atmosphere free from
moisture, il the protector could be
mounted upon an eminence sufficiently
high to clear all surrounding obstacles?