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.
Photographic prints may be washed in a stationary washbowl with just as good results as if washed in a high- priced wash box, by cutting off the upper end of the rubber nipple on a bent glass medicine dropper and placing it on the faucet as shown in the illustration. This arrangement causes the water to whirl around in the bowl, which keeps the prints in constant motion, thus insuring a thorough washing. - Contributed by L. O. D. Sturgess, Arlington, Oregon.
Ill: A Medicine Dropper on a Faucet Produces a Whirling Motion of the Water in the Bowl