24
and 25 is sketched in a rough way at _R_, while _N_ shows a glass cover,
and _M_ a wooden base of polished oak or walnut. This base is recessed
on the lower side to receive an eight-day spring clock movement, which
supplies the motive power for the model. This base is recessed on top to
receive the main plate _A_, Fig. 24, and also to hold the glass shade
_N_ in position. The base _M_ is 21/2" high and 8" diameter. The glass
cover _N_ can have either a high and spherical top, as shown, or, as
most people prefer, a flattened oval.
[Illustration: Fig. 26]
The main plate _A_ is of hard spring brass, 1/10" thick and 6" in
diameter; in fact, a simple disk of the size named, with slightly
rounded edges. The top plate, shown at _C_, Figs. 24 and 25, is 1/8"
thick and shaped as shown. This plate (_C_) is supported on two pillars
1/2" in diameter and 11/4" high. Fig. 25 is a side view of Fig. 24 seen
in the direction of the arrow _p_. The cock _D_ is also of 1/8" spring
brass shaped as shown, and attached by the screw _f_ and steady pins _s s_
to the top plate _C_.
Pages:
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78