ELECTRIC “EYE”

Evening Star, Issue 20388, 21 January 1930, Page 2

ELECTRIC “EYE”

FADING DAYLIGHT TURNS ON SWITCH TO AVOID EYESTRAIK When natural light becomes too dim for reading without straining the ej’es a photo-electric cell, installed at an American school, snaps - inside lights on. The cell is contained in a small box, resembling a radio set, near a window, and connections are made to the electric switch. The light coming through the window is deflected through a lens upon the cell. As long as there is sufficient intensity the unit remains inoperative, but as a certain carefully determined point is reached, when the light is too dim for the good of the pupils, the “eye” reacts upon an electric relay, and the room lights flash, on. Engineers point out that the plan is good in more than one respect. If the lights are left entirely to the teacher’s discretion, pupils in a less brilliantly illuminated portion of the room may suffer eyestrain without her knowledge, and turning the lights on too soon wastes current. According to investigators. 25 per cent, of high school graduates are afflicted with impaired vision, and 75 per cent, of this number owe their trouble to improper illumination in the schools, i ELECTRIC FINGERS. Somewhat like a hu"e flatiron in appearance an electric unit has been introduced for restaurant and household use. It has a number of sharp lingers that pierce the meat so that the cooking will be done more thoroughly and the piece made easier to cut and chew. The tenderer operates with current from a lighting socket, and is constructed to last for a long time. HOOVER’S TRIBUTE.

President Hoover, in a tribute to Thomas A. Edison, published in the ‘Electrical World.’ says: “By inventing the electric lamp Mr Edison did