WRITING IN THE SKY
LATEST IN ADVERTISING ' LONDON, January (J. Londoners will shortly see night skywriting visible for at least seven miles, following the invention of the grid searchlight. Luminous advertisements thrown on the clouds during experiments at Hendon and Portsmouth have been read at a distance of even 15 miles. This sky-writing projector is the first in the world that enables images to be thrown on the clouds as a whole, or letter by letter, like a giant pencil writing in space. The secret, as with the grid searchlight, lies in the breaking up of a mass of light into 300 separate rays by means of mirrors deflecting each ray along a path to build up an ultimate light image. The largest ’ messages so far possible are of 24 letters, hut there is no reason why a bigger reflector, or two projectors in conjunction, should not he used to cast a longer and deeper notice. A volume of light totalling 3,000,000,000 candle-power causes an image of great intensity to be thrown on the clouds, making the writing sharp and clear even when seen from brightlylighted streets.
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Otago Daily Times, Issue 21542, 14 January 1932, Page 8
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187WRITING IN THE SKY Otago Daily Times, Issue 21542, 14 January 1932, Page 8
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