460 Report on the Trials of Implements at Cardiff^. 
ings that sufficient advantage will be derived from an expensive 
elevator to repay the first cost quickly. There is no advantage 
in using an elevator until the stack has attained rather more 
than two-thirds the height of the loaded waggon, for until an 
over-head lift is required it is as easy to unload on to the stack 
as into the hopper of an elevator. With the horse pitchfork, 
on the other hand, some advantage is felt at an earlier stage, as 
the man on the cart has not to lift at all by hand. There does 
not seem to be any reason why elevators should not be employed 
to load the waggon in the field with hay that has been collected 
into windrows, since this is throughout an over-head lift. 
Perhaps a modification of Tasker's two-wheeled elevator 
might be fastened to the tail of a waggon, and the straw chain 
be driven by gearing from the axle of the travelling wheels. 
We find that this notion cannot claim the merit, or demerit, of 
novelty, for such machines are used in America — a country that 
will probably continue to be in advance of us in mechanical 
invention so long as the stimulus of high prices for manual 
labour is supplemented by patent laws that afford greater facilities 
and fuller protection than our own. In estimating the advan- 
tages to be derived from an elevator, we must add, to the direct 
saving of labour, the further saving of straw and labour in 
thatching, that results from carrying the stacks higher, as well 
as the benefit of greater pressure upon the hay. 
Class VI. — Seed Drawers. 
Only three machines were entered in this class ; they were 
driven by the same engine as that used in trying the threshing- 
machines, and with the same arrangement of the dynamometer. 
A small stack of clover-seed had been previously provided in 
the yard ; this was headed by an ordinary threshing-machine a 
short time before the trials commenced. The cob thus obtained 
was of poor quality, containing a very moderate quantity of 
small seed, tough, and difficult to draw. The quantity of seed 
extracted in tlie trial was much less than the machines would 
have obtained in the same time if the crop had been of average 
quality. 
Each machine was run for 15 minutes, and supplied ad 
libitum with seed in the cob. The results of the run are re- 
corded in Table VIII. Although column 8 records a great 
difference in the number of revolutions per minute of each drum, 
there was probably but little difference in the speed of the 
drum peripheries, for the drum of Hunt and Tawell's machine 
was of much greater diameter than the others. The amount of 
power in column 13, it should be observed, is calculated per lb. 
