230 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 
force enough to overcome light breezes. If greater distance is desired 
additional segments may be inserted. These are easily keyed together 
by a wire hanging inserted through the. joints. By removing the 
crooked segment or reversing it, the same implement may be used to 
deliver in advance of the person or in a downward, horizontal, or upward 
direction with a single or double cloud. This rotary blower can be 
combined with a wheeled cultivator and be operated thereby. Also a 
series of such blast-spouts supplied from as many blowers, more econom- 
ically from a single blower of large capacity, can be combined to form a 
compound machine. 
In Plate XXVII, Fig. 4, is one of these compound machines which I 
devised for use with a single horse and to supply six rows or two rows 
and two half-rows as desired. It may yet prove practical to use a 
greater number of spouts and supply a larger number of rows at each 
drive ; but my experience has only shown that three such spouts can 
be practically used. This machine was tested at Ithaca, K Y., and 
afterwards tried in the cotton near Atlanta, Ga. The thin tin of such 
a machine is apt to get bent unless very carefully managed. Stout 
sheet metal should be used for the drum especially. Many dents in the 
pipes have not proved seriously objectionable. The whole is mounted 
on an A-shaped frame, zz, having three wheeled legs, ttt, and is drawn 
by the shafts or whiffletree in front. The two lateral arms of the frame, 
2, can be set wider or nearer apart upon tbe cross bar, z, to suit wider 
or narrower row-interspaces. Each hind leg is a stout section of iron 
gas-pipe (l T 5 g inches), screwed or welded to an iron plate on its top, 
which is bolted to tbe frame. Its lower hollow extremity is mouuted 
on a swivel-pin, having an elbow extension backward to its wheel. 
These swivel wheels are intended to prevent side-draft strain, and 
are especially of value in turning. They need not be large or strong, 
as the hind parts of the machine have little weight. The front leg t 
is an arch of iron (3 by £ inch), bolted above, beneath the apex of the 
frame. Thus it is really a double leg 37J inches long. To the sides are 
fastened bars, Jc, extending forward to support the whiffletree, while 
to the lower extremities are boxed the ends of the revolving axle of the 
draft-wheel, w, and its large drive-gear, ti. These wheels are respect- 
ively 30 inches and 16 inches in diameter. The latter drives a small 
(3-inch) pinion on the axle of the large (14-iuch) band-wheel j. These 
are on opposite sides of one leg, to which their axle is boxed. The band 
is of very soft, light leather, and whirls the small (J-iuch) pulley with 
the fans on its axis in the drum. The eads of the casing are bilged to 
give stiffness, and its outside should be annularly ribbed or otherwise 
stiffened or encased for protection. The large powder can upon it is 
closed hermetically by a tight cap or cork. The three-way discharge 
must be somewhat downwards, and the pipes should slope down more 
and more as they advance. It is best to give them a projectile curve. 
This is for the purpose of keeping the powder toward the upper part of 
