the Philadelphia Centennial Exhibition. 
29 
is peculiarly valuable in the case of clover-crops, where the tedder is likely to 
do mischief by breaking the leaves. 
The next machine that claims attention is " The Haymaker " Mower, made 
by Otis Brothers and Co., of New York, which, in its simplicity and efficiency, 
appears a highly valuable invention. The motion is transmitted from the 
travelling-wheels to the knife by a single pair of bevel-wheels, and much 
friction is saved (Fig; 21). 
The driving-wheel A is keyed to the main axle B, and revolves with it. The 
oscillating internal bevel-wheel C is pivoted by a gimball-joint to the sheaf 
or frame D, in such a manner that it can swing round the point E, which 
is the apex of the gear-cone of the two bevel-wheels A and C. Two steel 
pins, E E, form the joint between the gimball-ring g and the wheel C, and 
two other steel pins at right angles with the pins E E form the joint 
between the frame and the gimball-joint ring. 
Fig. 21. — Gearing of Otis Bros, and Co.'s Haymaker Moicing-Machine. 
The internal bevel-wheel C thus secured, serves as one arm of the lever 
which operates the knife, while the triangular malleable frame H furnishes 
the other end of the lever, to which the link which operates the knife- 
head is attached at h, whilst the other end of h 1 furnishes a bearing for the 
guide-crank I. This guide-crank is shifted to one side of the main shaft, 
and the centre line of the shaft, as well as the centre line of the crank-pin and 
the centre line of the four joint pins radiate from the point F, which is, as 
before stated, the apex of the cone of the two bevel-wheels. The action of 
this device is as follows : — 
When the gear A revolves with the main axle, it causes the bevel-wheel C 
to swing on the centre of the gimball-joint, whilst the guide-crank I is turned 
in the opposite direction to the main shaft. Whenever the guide-crank I has 
made one revolution, C has been in contact with all the teeth of A ; and as C 
has 48, and A only 46, it has passed over two more teeth than A ; and when 
the revolutions of the guide-crank has gone on 23 times, we shall find the same 
teeth of both wheels in contact again. We have thus, for every revolution of 
the gear A, 23 revolutions of the guide-crank ; and during this one revolution 
1048 teeth have been in contact. But although the guide-crank makes a 
rotary motion, the oscillating-wheel makes a vibrating motion on the gimball- 
joint pin, and the arm H, which is in reality a part of the wheel C, makes at 
the point h a reciprocating motion from h to li\ which corresponds with the 
