294 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 
partly stripped the machine is much less concealed than it would be 
had a field of larger cotton been selected. The ground plan of the 
frame and system of pipes is diagramatically illustrated in Plate 
XLIX in Fig. 1, while the same device as folded narrow to be hauled 
through gat s, &c, is cut from a photograph as seen in Plate XL VIII. 
By reference to the diagram the frame, a x I z, is seen to be A -shaped, 
and is composed of two main bars, a, hinged together by a bolt, at o, 
extended by two long arms, x I, spliced on, at x, while a cross-piece, za 9 
is bolted on as a set-bar upon which the side bars can be set at a wider 
©r lesser angle. Numerous holes for this purpose will be seen in the 
cross-bar. This cross piece is also cut and spliced at its middle so that 
its one half can lap against the side of the other when the frame is 
narrowed. Beneath the side bars, near their middle, legged wheels are 
attached. 
These appear best in Plate XL VIII. The crank-axle of the wheel 
has a round, upturned pivot inserted in the base of the vertical leg 
which is tubular, being a piece of heavy gas-pipe with a solid T-plate 
welded in the top a*nd bolted to the frame. The crank-axle also has 
attached to it by a band clamp a stout brace extending upward and 
forward to the cross-bar. The pivot arrangement allows the wheel to 
be set parallel to the rows after being thrown out of parallelism by set- 
ting the side bars closer or farther from each other. The legs described 
elsewhere, and shown in the machine figured in Plate L, are likewise 
adjustable on a vertical pivot and answer the same purpose, while they 
are simple, strong, and on some accounts preferable to those here used. 
They may be employed on the A-frame instead of these. The frame is 
thus supported at its sides near the middle, so nearly all of its weight 
comes on the two wheels; but its forward half is the heavier, and this 
is sustained and the whole is drawn by the apex-attachment to the 
hind eud of the body of a wagon. This frame should be hinged fast, 
preferably near one corner of the body and at a point over the center 
of the row interspaces. This can be done in various ways, but a move- 
ment up and down as well as laterally and some degree of rocking 
should be allowed at this joint between the wagon and the frame. It 
can be linked by a clevis or otherwise to the eye of the end-gate rod ; 
but a stronger fastening consists of a thick block 4J by inches a 
little longer than the width of the box, but with its ends halved out to 
allow it to drop snugly half way in and hang close against the end- 
gate, against which it is pulled by the frame which has a pivot or bolt 
inserted through its front end and through one end of the block. By 
this arrangement the strain upon the end-gate is somewhat equalized, 
and the whole is easily detached, for at this connection the wagon 
should be conveniently separated whenever it is to be driven off Jbr a 
fresh supply of water. 
In Plate X LI X, Fig. 1, the system of pipe-branches appears separated 
slightly from the side bars to which its main branches are normally at- 
