Modern locomotive engineering, with questions and answers .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co · leaf 214
r good feature of this design is, that the spring THE INDICATOR 20: can be easily removed without disconnecting any onepart of the instrument in case it is desired to changesprings. A cut of theimproved instrument isherewith presented. Fig. 99 is a sectionalview of the AmericanThompson improved…
Locomotives
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