LAWTON'S IMPROVED POTTERY KILN. are provided which are opened when the kiln is being burned off. This facilitates cooling. A short movable A SIMPLE ELECTRICAL MACHINE Remedy ior Color Blindness. rare als that yellow-blue color blindness is very rare. The common form is the green-red blindness. It so happens that in the establishment of signals green and red lights form the most commonly used colors hence from three to five per cent of men capable of doing work as pilots or engineers are kept out of such employments often with results that are almost cruel. Most color-blind men can readily
LAWTON'S IMPROVED POTTERY KILN. are provided which are opened when the kiln is being burned off. This facilitates cooling. A short movable A SIMPLE ELECTRICAL MACHINE Remedy ior Color Blindness. rare als that yellow-blue color blindness is very rare. The common form is the green-red blindness. It so happens that in the establishment of signals green and red lights form the most commonly used colors hence from three to five per cent of men capable of doing work as pilots or engineers are kept out of such employments often with results that are almost cruel. Most color-blind men can readily distinguish yellows and blues and the doctor proposes that the red lights should have a distinctly yellowish tinge and the green lights a distinctly bluish tinge. In this way the differ almost all the color blind. LAWTON'S IMPROVED POTTERY KILN. ^ NECin _ N CONE JOINTS APPI ED 70 A SIMPLE ELECTRICAL MACHINE., scientific american, 1893-10-21
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