This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
It is very hard to locate an electric-light globe in a dark room. Anyone trying to find one by striking the air in its vicinity with one hand, usually finds that the globe is not there, although the hand may have passed within 1/2in. of the globe.
The best way to locate a globe is to approach the proximity of the drop with thumbs touching and fingers extended as shown in the sketch, in which manner the hands will cover a radius of about 14 in. and offer a better chance of locating the light quickly than if one groped about with one hand extended. - Contributed by Victor Laba-die, Dallas, Tex.