alue of various lubricants, the particular ma- verse the coils of the one or the other of the electro-magnets, The uniform rotation of the disk, A, is secured by the chine illustrated being one which was exhibited by the com- g g. The arrangement of the connections will be readily use of a… … in opposite directions. On the centra) ascertained, while, the duration of the part of the shaft, /, a screw is cut, and experiment being duly noted and the Figs. 2 and 3.-TESTING LUBRICANTS. a nut, e, fitted to this screw carries a elevation of temperature registered, the fork acting on the belt…
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