THE YOUNG SCIENTIST. 
33 
tion in which it should be held is shown in 
the cut, Fig. 4, A being the work, B the 
<5hisel, and 0 the lathe rest. Some expert 
workmen hold it at an angle as denoted by 
the dotted line D, which makes it cut very 
freely and clean, but increases the liability 
to dig into the work; hence learners should 
hold it as shown. 
Another excellent finishing tool is the 
«kew-chisel, so called because its cutting 
■edge is at an angle, or askew with the body 
Fig. 5. 
of the tool. This tool will cut very clean, 
leaving a poHsh on the work. It also has 
the advantage that the body of the tool may 
be kept out of the way of flanges or radial 
faces when turning cylindrical work, or may, 
by turning it on edge, be used to finish 
radial faces. It is shown in Fig. 5 by itself, 
and on the left turning up a globe. It is 
held so that the middle of the edge does 
the cutting, and this tends to keep it from 
digging into the work. The bevels forming 
the cutting edge require to be very smoothly 
oilstoned. 
The whole secret of the skilful and suc- 
cessful use of this valuable tool lies in giv- 
ing it the proper inclination to the work. 
It is shown in Fig. 6 at E, in the proper 
position for taking a cut from right to left, 
and at F in position for taking a cut from 
Fig. 6. 
left to right. The face of the tool lying on 
the work, must be tilted over, for E as de- 
noted by A, and for F as denoted by the 
line B, the tilt being only sufficient to per- 
mit the edge to cut. If tilted too much it 
will dig into the work; if not tilted the edge 
will not meet the work, and therefore cannot 
cut. For cutting down the ends of the 
work, or down a side face, it must be tilted 
very slightly, as denoted by C D, the 
amount of the tilt regulating the depth of 
