found to be correct in prac- respondents. tice, particularly so when the difference in diameters of two Coal Tar and Its Products as Preservatives for wheels working in each other is great: Wood. R—R' R + r' Messrs. Editors:—In referring to an article with the above -P ab ■ ac. R + 2r' R—2 R'… … In the diagram let R r represent the radii of pitch lines of It is well-known that carbolic acid affords an excellent the wheels. means for preserving animal matter from putrefaction. This P, the pitch. fact has led to the conclusion that the heavy tar oils would be R' r', the radii of two circles…
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