[Illustration: Fig. X.]
Fig. X. illustrates the hammer as attached to the batten; _a_ to _b_,
(equals 3 inches in width in our present illustration), represents the
head of the hammer, forming the foundation for steadying the cylinder
in its turning. The hammer is pressed for this purpose towards the
cylinder by means of the spring, _s_ to _r_. Parts _h_ and _k_ guide
the hammer in its up and down movements, and are solid parts of the
batten. By turning the cylinder the hammer is pushed down in the
direction of the arrow, _t_, thus compressing the spring, which returns
to its normal position after the cylinder has completed its turn, ready
for being advanced towards the needle-board.
The following are accurate measurements of this part of the machine:
Height of head of hammer at _a_ and _b_, = 1/4 inch.
Thickness of hammer-head, _e_ to _c_, = 3/8 "
Height of hammer-head when at rest
above the top guiding part, _c_ to _o_, = 1-1/2 "
Width of the guiding-rod, _c_ to _d_, = 1/2 "
Thickness of “top guide,” _f_ to _g_, = 3/4 "
" “lower guide,” _f_ to _r_, = 1/4 "
Distance between these guides, = 9 "
Total height of guiding-rod, = 10-1/2 "
The shaded part of the drawing above the hammer represents the
cylinder, _i_, which has its shaft for turning at _m_.