Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 128
ety is fully 10, and that any fears as to theefficiency of this break are unfounded. The break has been found anefficient means of checking the motion of heavier things than the wheels of acalculating machine. Against this break may be urged the fact that more mechanical workis spent in driving the… … Fig. 39. the old-fashioned double spring is likely to fail I am not in a position to say ;I think I may safely say that the simple spring that takes the place of thisdouble spring can never fail. During recent times many other important patented improvementshave been incorporated, and the…
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