Exposition Searchlight Signals to Toronto"
Electrician, v. 29, no. 8, (Aug. 24, 1901) p. 114. (No author
cited.) text is reproduced here in full.]
from the 30-inch searchlight on the Electric Tower of the Pan-American
Exposition were sent to Niagara Falls, July 25th, by Professor George
F. Sever, superintendent of electrical exhibits, in the presence
of the electrical jury, thus demonstrating the feasibility of this
method of signaling at night.
time searchlight signals have been sent from Buffalo to Toronto,
a distance of 58 miles, through arrangements completed by Professor
Sever, in co-operation with Mr. William S. Aldrich, consulting electrical
engineer of Toronto. The first trial was made about 9 p. m. on August
9th, with clouds over Toronto. The local illumination of the overhead
sky by the electric arc lights in the streets of Toronto effectually
prevented any discrimination being made between the local and the
Buffalo illumination of the clouds. The second trial was made between
9:50 and 10:15 p. m., August 13th, with a perfectly clear atmosphere.
Owing to the smoke settling down over the city of Toronto, no signals
could be discerned from the top of the Municipal Hall tower in that
city. This was the pre-arranged objective point for both experiments.
communication was arranged between the top of the Municipal Hall
tower and the Electric Tower at the Pan-American, through the courtesy
of the Bell Telephone company, represented by Mr. Dunstan of Toronto,
so that every detail of the experiment could be followed. The special
instructions were to depress the searchlight to the lake horizon,
bearing on the Municipal Hall tower, Toronto; then, to sweep the
horizon a definite angle, to the right and left of this bearing,
and later to elevate and depress the light on the original bearing.
All of these signals were very clearly discerned during the second
trial by Mr. C. H. Rust, city engineer, Toronto, with party located
on Center Island, two miles off shore from the city.