Robert Blair, San Francisco, Cal.--In this improved tool there is
a clamping bolt by which the cutters are clamped fast after being
adjusted. The cutters are arranged to slide directly across the stock
in dovetail grooves, and are slotted to slide along the clamping bolt
and washers, by which they are clamped fast after they are adjusted
to the position required by a toothed pinion and racks. The pinion is
arranged in the stock between the cutters, and the shaft extends out
of the end of the stock, with a nick in the end for a screwdriver to
turn it.
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