COMPOUND WHEEL TRAIN.
267
Starting from the turning pair 2 we have, on each side, simply a pair of spur-wheels with their connecting link. We write them singly and add them together as follows :
2 b, a I 2
c+ ...
... C\
><?t ...
... (C) ... |
| ... C-
2
c,
3
2
2 C+ ...
b,
\ Rj
a,
1
... (C)^} i t f*i\ \
..ii Iff-
I ,
c, <f
i ... (6)...) 3
This shows two binary links a, 1 and d, 3, and two ternary links, 2, 5, c and 2, 1, 3. The latter are the coupled wheels b and c with
FIG. 187.
their common spindle, and the bar with the bearings, which as the underlining shows, is fixed.
We may obtain the formula in another shape as follows. Begin- ning with the wheel a and its spindle, we then write the wheel b and its connections at once as a ternary link ; continue with d, and write its linkage with 3 ; and then unite the second cylinders of 2 and of 3 with 1. For distinctness' sake we use the uncontracted form.
1 a, I 2 I
C+
c,d
