THE YOUNG SCIENTIST. 
21 
ing it off and on the lathe. It will be seen 
that a T-rest is used in addition to the 
slide rest. This is handy for making 
chucks, for turning out the backs of the 
cells etc. A rib is seen under the frame 
be turned parallel to the face-plate, or, in 
other words, at a right angle to its fellow. 
Fig. 3.— SLIDE BEST. 
The opposite side of the right part of the lathe 
represented in Fig. 1, and showing the set-screw 
referred to in the text. 
or base of the lathe by which it is held in 
the vice. If worked by the foot, a wheel 
treadle can be easily fixed underneath the 
board to which the vice is bolted." 
The Lathe Angle Plate. 
BY JOSHUA. ROSE, M. E. 
THE angle plate is one of the most 
useful devices employed in holding 
lathe work, and if properly used will give 
the most desirable degree of truth or ac- 
curacy to the work. 
Its uses may be divided into two prin- 
cipal classes ; first, to ensure that one part 
of a piece of work shall be at a true right 
angle to another part, and, secondly, to 
ensure that a part of a piece of work shall 
stand parallel to another part. 
An example of the first kind is shown in 
Fig. 1, in the accompanying illustrations, 
in which P is a pipe bend requiring to 
have the faces of its two flanges stand one 
at a right angle to the other. The angle 
plate. A, has its two surfaces at a true 
right angle ; hence, when one surface is 
bolted to the face-plate of the lathe the 
other will stand at a right angle to the 
face-plate ; hence, if one flange be bolted 
or clamped to the angle plate, as shown in 
the engraving, it will stand at a right I 
angle to the face-plate, and the other will ' 
Fig. 1. 
It would be a very difficult matter to 
chuck a pipe bend without using an angle 
plate. The weight, W, is employed to 
Fig. 2. 
