MC;
The "beak" is actually a pen nib. Drawing sets could include both (pencil)
leads and ink dispensers. On your example, there should be a small
thumbwheel and "T" headed bolt that adjusts the size (width) of the line
formed by the point of the "beak". The gap between both points serves as the
ink reservoir-dip the point into a bottle of ink and the gap collects a
small amount of ink that is dispensed as you draw the line. Often, the ink
dispenser is interchangeable among the different pieces, which almost always
included a straight tube that could be used with the ink dispenser as an
instrument for drawing straight lines (with a raised-edge straightedge or
writing freehand).

A veritable cornucopia of questionably useful information am I

Ed in Ottawa

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