Richardson's handbook of projection (1927)

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706 HANDBOOK OF PROJECTION FOR adjustments. The carbon jaw holders are carried by two ^ inch steel bars placed 31/4 inches apart. Between them is a very coarse threaded screw by means of which the carbons are fed together. Its pith is such that one turn alters the distance U- s. «o +1V s=£SB«p_ (1 3navi 33S * fr CO ' ■ > ■* s £ z "* £ o en 00 •a* in 51? en a* CVJ T =1» O <* en CO ro CO CO ID M<5 CO CO «<0 CVJ m ■<* 0) en 00 a* IN. u»0 m (T) NJ* CM oo o m en rvi CO CVi CO CVI in CM CM CM 5 Z o 00 1 to 1 i (VI b °CVJ V CO 00 b °CVJ V CO 00 b (VJ "cu CVJ CVJ CO CM ' ,. -y Figure 252.