and Miscellaneous Implements at Bristol. 127 
q, support-plate, which carries the hrass hearings in which the cup-wheel 
spindle revolves. 
This support-plate turns on a fixed pin, w, and, by raising the catch p, the 
plate and bearings fall away from the cup-wheel spindle, leaving the spindle 
free to come out of the seed-box u ; r, stud fixed in counter-shaft c, to drive 
the hollow spindle d. 
Fig. 33— Sviyth's Drill. 
s, cup- wheel spindle, supported at each end of the box in bearings affixed 
to the plate q. 
t, iron side-plates which carry the seed-box (c, Fig. 31) ; the point of support 
is shown cut away, in order to show the gearing arrangements, 
u, seed-box. 
V, recess in shaft c, to receive a forked lever for sliding the shaft endways, 
in order to bring the cog-wheel b into gear with the nave-wheels a or a', as 
may be required. A larger cog-wheel can be placed on the hollow spindle d, 
in place of e ; but when this is attached, the bolt k is moved into the groove 
n, in order that the intermediate wheel / may gear properly in e. 
The above explanations of Figs. 32 and 33 will enable the 
reader to understand the very simple mechanism by which an 
alteration of speed is provided for the cup-spindle, according as 
the dr^ll is travelling up or down hill. For want of this arrange- 
ment we frequently find great irregularity of seeding, and a 
reference to the Report of the Drill-trials at the Centennial Ex- 
hibition will show that, even in the best force-feed drills, when 
on the hill-side and level, the regularity was almost perfect ; 
serious differences of discharge were noticeable up and down 
hill. " ^ 
At the Paris Exhibition, trials of drills were carried out at 
