free extra that is latent in PER PLUME. For livelier, smoothgreater > i ETHYL £ VJiCMIUMj 01 b, cpmPANr PT y. Ltd. lii'COt*&<&>*'*Te*Ct *•■>* ia/ * \*A-<JS l *'ft./i4.r*>>.
Eyesight of mail sorters in one of the principal post offices of the United States is protected by "electrical eyes" that control louvres or shutters on the skylights. Adjusted to maintain the correct level of illumination in the sorting room, regardless of outside weather conditions, these electric eyes, or photo-electric cells, open and close the shutters, letting in the proper amount of light. Nine shutters, about twelve inches wide, run the length of each of four skylights. Each shutter is hinged at the top, and the nine are raised or lowered in unison by a mechanical arm powered by an electric motor. A master electric eye on the roof permits the shutters to open all the way on cloudy days, but only part way on bright, sunshiny days. J* our electric eyes are suspended from the sorting room ceiling, one facing each skylight. As the amount of daylight falling on one of these eyes varies, it starts the motor which opens or closes its skylight shutters as much as needed.
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Bibliographic details
Press, Volume LXX, Issue 21319, 12 November 1934, Page 6
Word Count
195Page 6 Advertisements Column 1 Press, Volume LXX, Issue 21319, 12 November 1934, Page 6
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