Playtner, H. R. [from old catalog] · Chicago, Hazlitt & Walker · leaf 38
Fig. 17. Fig. 18. Fig. 19. Fig. 20. pin under discussion will begin action 4^2° before the lineof centers, being an engaging, or uphill friction of con-siderable magnitude. The intersection with the fork is also much less thanwith the wider ruby pin, making the impulse action verydelicate. On the…
Clocks and watches
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