8 
LEVER HORSE POWERS — continued. 
$ 53. The principle of applying the muscular power of horses, by their draft upon a lever 
should be carefully investigated by every man having occasion to use horse power. 
With the Lever (unlike the endless chain, which applies its force tangentially, or at right 
angles with the radius of the reels) the force of the horses is applied to the end of the 
lever, and at an acute angle, which angle is equal to that produced by a chord of an arc of 
so much of the circle described by the end of the lever as is required for the length of the 
horses and their trappings. This chord always being equal to the length of the horses, &c, 
its angle with the lever varies in proportion as its arc bears to the whole circle described by 
the end of the lever, and is more or less acute as the difference in the lengths of the levers. 
§ 54. It will be admitted that whatever be the difference of the angle less than 90°, or 
than a right angle, just such a ratio of loss of power is the consequence ; and inasmuch as 
a short lever produces a more acute angle of draft, the loss is more than with a long lever. ^ 
In order to demonstrate this problem diagrams would be desirable, but, without them, it 
will be sufficient for the purpose to state the results produced by the application of the 
power under the different angles of draft caused by the difference in the lengths of levers. In 
the following tabular arrangement, the length of levers is given, also the several angles in 
degrees, the length of lever which would be required, were the force applied tangentially 
to produce the same result, and the per cent of disadvantage or loss by the acute angular, 
over the tangent or right angular draft. 
Lever, 14 ft.; angle of draft, 65°; length required with right angle draft, 12.5 ft.; loss of power, 9| per cent. 
« 12 ft. " " 60° 61 " « 10.4 ft. Si " 15| « 
« jo ft. « « 54° « « " 8.0 ft. " " 25 " 
« 8 ft. " " 42° " " " 5.2 ft. " " 54 " 
§ 55. Thus demonstrating why the endless chain is the most economical where its results 
in operation are satisfactory in amount. 
It also explains why the results with eight and ten horses, and same number of men to 
attend, are scarcely ever equal twice that produced by the Endless Chain, with only two 
horses and four or five men. 
§ 56. Although the Lever Power has the advantage of producing greater results, by em- 
ploying more men and horses, than the Endless Chain Power can do, as now made, and as 
described in this circular, it will readily be seen that the ratio of increase in the expense of 
threshing with the Lever or Sweep is much greater than it is in the increase of results as 
compared with those of the Endless Chain. Annexed is a statement showing the relative 
expense and results of operating both kinds of machines. This is made from the actual 
average results, &c, so far as a very extensive experience has enabled the Proprietors to 
compute them. 
EMERY'S PATENT 
ENDLESS-CHAIN HORSE POWERS, 
Estimated for 10 hours. 
Four men to attend, at $1, ......... .$4 00 
Two horses, at 50 cts., 1 00 
Boarding men and horses, at 37| cts.,. 2 25 
Amount in bushels of wheat, 200, $7 25 
Equal to over 3 cts. 6 mills per bushel. 
EMERY'S PATENT 
LEVER HORSE POWERS, 
Estimated for 10 hours. 
Ten men to attend, at $1, $10 00 
Eight horses, at 50 cts., 4 00 
Boarding men and horses, at 37| cts.,. 6 75 
Amount in bushels of wheat, 300, . . . $20 75 
Equal to over 6 cts. 9 mills per bushel. 
This is supposing the farmer to own his own machine in both cases, and charging nothing 
for the use and wear of the same, which would, if reckoned, make the odds against the 
Lever Power. As it stands, it will be seen that the increased cost of threshing with the 
Lever Power over the other is ninety-two per cent. 
$ 57. Should the calculation be made upon the supposition that the farmer hires his grain 
threshed by either machine, the relative cost to him will be about as follows : 
WITH LEVER POWER. 
Eight of ten men required, $8 00 
Four horses of eight required, 2 00 
Boarding ten men and eight horses, ... 6 75 
Price of threshing 300 bush., at 5 cts., 15 00 
WITH ENDLESS-CHAIN POWER. 
Three of four men furnished by farmer, $3 00 
Boarding four men and two horses, . . 2 25 
Price of threshing 200 bush., at 5 cts., 10 00 
$31 75 
Equal to 10 cts. 6 mills per bushel. 
$15 25 
Equal to 7 cts. 6 mills per bushel. 
Making the difference forty per cent more with the Lever Power than the Endless Chain. 
§ 58. Again, the conclusion is in favor of the Railroad Power, whenever and wherever 
the results of its use are sufficient to satisfy the demands of those using Horse Powers. 
§ 59. Another advantage with the Two-Horse Power is that it enables the farmer to do his 
own work with his own men, and at any and all times to suit himself, the weather or the 
markets, and avoid the dreaded threshing time, with its regiment of cavalry, to say nothing 
of the waste of grain, the risk of damage by bad. weather, the delay in waiting upon promises 
of others to do his work for him, the loss of time, the expense for men and boarding, &c, 
-while waiting for repairs or on account of bad weather. 
