black lines, thus concealing them O, and the burr E, is operated by turning the crank N, the machine, Fig. 2 is a vertical cross section, and Tig. from view on the back. and thus cuts away the back of the tooth; by turning the 3 is a longitudinal section through the screw-shaft. hand-wheel M, the… … On the front ot the envelopes, there is but one thick- ing the teeth upon straight as wellas circular saws. is operated by turning the crank N, while its feed is ness of paper over the black lines, and by pressing the xy face down, they are clearly visible. Thesc lines form an admirable guide for…
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