Scientific American 333 APRIL 21, 1906. tal to durability or other desirable prop- did he know its real character. The in- correct use of the term is found when a Construction claim is made that a mixture, say of white lead and zinc oxide, or a combina- tion of either with a proper proportion of… … dition of the inert matter must ‘be proper- ly regulated in order to insure the most efficient service. Up to this point in the discussion we have assumed that definite knowledge The above illustration shows this enormous Burglar-Proof Round Door and upen the part of the consumer has ex- various…
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