ROTARY BLOWERS. 
231 
the blast and to prevent it from depositing in the pipes, which should 
terminate near the ground in the manner already described. The me- 
dian pipe descends immediately, but the two lateral ones are attached 
along the sides of the frame and to the hind legs, behind which they 
terminate, as shown. Such a machine is very light, and a mule or even 
a man can poll it easily. The velocity of rotation will vary from 800 
to 2,000 revolutions per minute, according to the speed with which it 
is hauled. 
"The following is a machine, invented by Mr, < Iharles T. Hard, of Vic- 
toria, Tex. (Patent No. 145049, December 30, 1873). It is intended to be 
attached t<> a cultivator or simi ar machine, and is drawn over one row 
of plants at a time. It CODSlStfi of a tan, or blower, inclosed in a cylin- 
drical casing, and conjoined with a box containing the poison. The pow- 
der is scattered over the plants by means of a vibrating wire or cloth 
sieve at the bottom of the box, and at the same time converted into a 
cloud of dust by a current of air created by the fan already mentioned, 
and which is operated by a pulley or band running from the axle of the 
blower to a wheel on the supporting axle of the cultivator. 
"In Plate XXIX, Pig. 1 represents a sectional elevation of the apparatus as attached 
t<> a cultivator, snowing OB6 end of tho box A partly broken away; Fig. 'J, a plan 
view, with a part of the blower-box removal ; Fig. 3, a rear view of the blower-box 
and powder-box as attached to the cultivator :ixles. 
"A represents an oblong box, tapering to the bottom, which contains the powdered 
poison, having a llap or door, /, on its top, and opening at said bottom onto a wire 
■eieen or cloth, b, running from 8Dd to end oft lit- box, which screen is oscillated length- 
wise and across the row of plants by ;i lever, </, pi voted on one side of the box A, and 
engaged ;it the other end against a rotating cam, r, upon the axle of the blower B. 
A spring, /, keeps the lever engaged with face of the cam. The blower B is confined 
alongside of the box A in a cylindrical casing, B', of a common form, and is mounted 
on a horizontal axle, g, which ends in a pulley, A, opposite to another pulley, i, upon 
the supporting axle ■ of tho cultivator. 
V The box A and the blower-box form one whole box, and is supported at either end 
by arms/; k, whieli are centered upon the said supporting axles SI m, for the purpose 
of allowing the box A to bo raised or lowered in the application of the powder. A 
ratchet or brace, for this purpose extends from tho box A to a convenient part of 
the cultivator. The orilice r of tho blower-box opens parallel with or close alongside 
of the oscillating screen b, so that tho air current catches and directs the powder 
against tho plants as it is shaken through the screen from the powder-box. 
"To confine the powder to the plants and vicinity, side guards or hoods E E, of sheet 
metal or light wood, as shown by the dotted lines, may be advantageously employed, 
and be attached to the supports k k or other convenient part or place. 
"A 6eat may also be attached to the arch p or beams D D of the cultivator for the 
use of the driver." 
"It is evident that this apparatus neither saves material to any great 
extent nor time in the application of the poison, since only one row of 
plants is dusted at a time. The only possible advantage it can have is 
in so distributing the poison in a fine dust that it attaches to the under 
side as well as to the upper side of the leaves"; yet this is not effected 
so well as it will be done by machines discharging the powder blast ill 
