designed a somewhat similar the slotted block detains -from traversing a wheel instrument based on like general driven by the worm on the pen- head socket, but leaves it free to principles, but very different in con- 7 turn on the screw fixed in the frame. struction. Of the two photographs herewith… … ment are all the figures'of a one- mentioned, the letter indicating the part. geometric chuck, and others A PLAN VIEW OF THE CAMPYLOGRAPH. upper wheel comes first and the quite beyond the scope of that in- large or small letter indicates the strument in its more complicated larger or smaller wheel…
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