INSPECTING APPARATUS FOR WORLD FAIR

Four observatories, Harvard, Ann Arbor, Yorkes, and Alleghony, will train their telescopes on Arcturus Saturday and, in the event that it is clear weather, will send its light to Chicago to open the World's Fair at exactly 9 o'clock Eastern Standard Time.

The light will be caught by a photo-electric cell and transmitted over the wires to Chicago where the impulses will throw four switches set in series.

If it is cloudy at any of the observatories the director will press a button and transmit the signal to the Exposition. W. A. Calder, tutor in Astronomy, who has been doing research work in astronomy with the photo-electric cell, has invented and set up the apparatus that will be used on the 24-inch reflector at Oak Ridge.

Arcturus has been selected as the star whose light will be used to open the Fair because we are now receiving light which left the star in 1893, the date of the last World's Fair at Chicago.