34 
THE YOUNG SCIENTIST. 
i 
Parallel Pieces and Parallel Strips. 
BY JOSHUA ROSE, M. E. 
PARALLEL pieces for lathe work are 
pieces of metal of parallelogram form, 
employed to hold work away from, but 
having bolt holes so that they may be 
made to grip the work. 
In the accompanying illustrations the 
employment of both these useful devices 
is shown. A, A, are a pair of parallel strips 
containing the brasses, B, B, and clamp- 
Fig. 1. 
true with, the lathe face-plate. Parallel 
strips are similar pieces (usually of steel) 
Fbri. 2. 
ing them because of the bolts, E, E. A, A, 
rest upon the parallel pieces, C, C, the 
whole being clamped to the face-plate by 
the bolts and plates, D, D. 
By this means the brass can be bored 
true to the inside faces of the flanges 
(which are true because they have been 
fitted to the strap to which they belong), 
which rest against the faces of A, A, the 
latter being kept true by the parallel 
pieces, C, C. The back faces of B, B are 
held clear of the lathe face-plate while 
the front faces are free and clear for turn- 
ing. Care must be taken to tighten up the 
bolts, E, E, alternately and equal, or one 
brass may be gripped tighter in the strips 
than the other, and the latter would 
hence be liable to move from the pressure 
of the cut. 
— The smallest circular-saws in use are 
those employed in making gold pens, and 
are only half an inch in diameter. 
