Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 245
Fig. 20. … Fig. 21.238 WHY SOME WORKMEN FAIL TO SUCCEED. the paper; a pivot covered with oil will gather up much moreof this dust than any one would imagine. Place such a pivotunder the microscope and you will not be surprised that somepivots are soon worn nearly through. Fig. 19 shows the par-ticles of dust…
Clocks and watches
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