Scientific Aiverican, [JuLyY 31, 1886. 78 … view of cars and track; section through dum my and SUPPLEMENT No. 487. Price 10. cents. To be had at tion of a single lubricant under a wide range of investi- roadbed; various views of Pi sections of tubes, pul- this office and from ail newsdealers. gation concerning its friction. Illustrated with…
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