32 
Report on the Agricultural Implements at 
on one side of it. This sleeve fits loosely around the axle, and serves to 
transmit motion from the inside of the nut to the lever. The sections being 
all alike, the bolt section is fitted in between the two nut sections, in the 
same manner as the bolt is fitted to the ordinary nut in a common jack- 
screw. One section of the nut has a hub, by which it is fastened to the 
main axle, and rotates with it; the other section of the nut is on the opposite 
side of the bolt section, and rotates with the first-mentioned nut section, beinc 
fastened to it by means of a rim, or band and bolt. Fig. 26 shows the 'move- 
ment, crosshead, and part of the shaft connected 
together, with a portion of the ring of movement cut 
away, showing internal construction. As before 
mentioned, the bolt section is placed between the 
two nut sections, and enclosed in a cylindrical box, 
formed by the two nut sections, and the band join- 
ing them together. The hub or sleeve of the bolt 
section passes through an opening in one of the nut 
sections, and is fastened to a lever. Fig. 27 shows 
crosshead, standard or pivot, and vibrating lever 
with buffer and joint, to which the knife Ts con- 
nected. The motion of the bolt section is therefore 
■communicated to the lever, and through it conveyed to the end of the sickle 
or knife. It is obvious that by this combination of the right and left hand 
screws into one, a reciprocation of the internal section or bolt is obtained by 
the continuous rotation in one direction of the two outer sections or nuts, 
provided the bolt is secured from revolving, but still permitted to vibrate in 
line with the axis of the nut. The axle is secured from moving in the direc- 
tion of its axis by flanges or collars bearing against the framing." I trust 
that this description, with the assistance of the illustrations, will familiarise 
my readers with this highly ingenious mechanism. Mr. Goodwin claims that 
this is the lightest-draft mower made ; and in support of this states that, 
with a full-sized machine, he has operated the movements from the driving- 
wheels to their connection with the cutter-bar (when the knife was detached) 
by 1 lb. weight applied to the rim of the driving-wheel, the latter of course 
being raised clear of the ground ; also that with the knife in, the same result 
has been accomplished by a weight of 3h to 4 lbs. Of course this does not 
prove that the power is as economically applied when work is being done. 
The following details as to leverage, &c, will be interesting : — By reference 
to Fig. 27 it will be seen that the ends of the crosshead are turned cylindri- 
cally, and are really used as a sort of jernal-bearing, to which the lever is 
attached, and by which it is operated. The fulcrum of the lever is attached 
to the main frame at a point 5 inches behind the centre of the axle. The 
lever is 30 inches long, and the power being applied between the fulcrum and 
the point of resistance, at a distance of 25 inches from the resistance, and 
5 inches from the fulcrum, we have a leverage of five to one. A movement 
of one half inch at the point where the power is applied, gives a movement of 
3 inches at the point of resistance; in other words, the knife travels six times 
