300 General Notes. [March 
oscillates. At the cutting end of the lever a spring pulls the 
lever down and effects the sectioning and also the adjustment for 
the next section. The. lever is pushed over and adjusted for the 
successive sections by a hollow screw, through which passes the 
trunnion on the side away from the knife. This screw is fixed 
excursion. An adjustable sector by the side of the toothed 
i : ; 
thickness, If a given radius of the wheel is moved through the 
arc embraced by a single tooth, sections are cut having a thick- 
ness of only zg} yp Of an inch, or .0025 mm.,—a thickness which 
at Abe orc which adjusts the block for cutting } tly fifty threads to the inch 
and there are two hundred teeth on the periphery of the toothed wheel. The value 
of a single tooth is, therefore, Jy X hy = roys inch. l ror OFN 
$ 
