Screw one standard
down to a wood base; slip one end of the barrel into it; pass the other
standard over the other end of the barrel, and adjust everything so that
the barrel ends are flush with the, outer surfaces of the standard, and the
nicks of the barrel in line with the standard nicks. Then screw the other
standard to the base. Solder must be run well into the joints, as these
will have to stand all the longitudinal working strain.
The next step is the fitting of the cylinder covers. If you can obtain two
stout brass discs 2-1/8 inches in diameter, some trouble will be saved;
otherwise you must cut them out of 3/32-inch plate. The centre of each
should be marked, and four lines 45 degrees apart be scratched through it
from side to side. A circle of 15/16-inch radius is now drawn to cut the
lines, and punch marks are made at the eight points of intersection. Solder
the covers lightly to the foot side of their standards, marked sides
outwards, and drill 1/8-inch holes through cover and standard at the punch
marks. Make matching marks on the edges. Unsolder the covers, enlarge the
holes in them to take 5/32-inch screws; and tap the holes in the standards.
Pages:
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123