LAMP’S FIVE MILE RANGE

Hokitika Guardian, 8 June 1931, Page 2

LAMP’S FIVE MILE RANGE

READING BY DISTANT RAY. VLEVELAM) (Ohio), April 11. Projection of light from a bull) only about five or .six times larger than the ordinary lamp used in the home, so that a person five miles away is aid-’ to road a newspaper by its rays, has been demonstrated here.

The demonstration was conducted by W, A. Pen now, airport and airway lighting engineer with the Westing* house Electric and Manufacturing company, during a meeting of the Elgctricap League of Cleveland. The light was projected from a searchlight throwing a narrow beam over Lake Erie. The beam spread only slightly ovier its course, Mr pen now explaining, that the spread was only 1— it a mile. Thrown on the clouds, the searchlight is designed principally to aid aviators in determining the height of cloud hanks,” Mr Pennow suits. “The narrow beam makes the determination more accurate than previous methods. Used in fighting fires the searchlight can pentrate almost every kind of smoke, except the blackest pall.

“The searchlight, containing a 4‘20watt lamp, produces 1,840,000 candlepower. Four per cent, is lost every 5,C00 t. in a clear night. Light haze will absorb about 10 per cent, every I,oool't. In heavy haze the light can lie seen a mile.”—Pouter.