. The literary digest. Lubricants A grade for each type of service Anew science writes its markacross the faces of two hemi-spheres. The last 50 years havebeen called the Mechanical 50 years ahead will bring theage of Mechanical Ktficiency. In 1913 an international con-ference of \ acuum Oil Companyexecutives and en^rineers from 14 \^ VACUUM OIL COMPANY Sptcidimta in the manufatturf of htgh-grad* tuhrtrant* for etmru rtauM nf marhinrrt/. Ohtnifmhlr ri-rrt/iihere in fhr iti*rU NEW YORK. USA T^ LlN TIk Literary Digest for March 22, 1919 141.

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