GRAVITATIONAL \ SIFTERS. 
307 
arc secured two semi-cylindrical plates, P, with their convex sides upward, and with 
tin ir inner side edges near and apon the opposite side of the handles, B. In bearings 
in the opposite sides of the two plates. P, revolve the journals of two cylinders. 
Q. ma. It- of finely-perforated sheet metal or fine wire-gauze to sift the dry powder 
poison upon the plants. 
••The sifting-cylinders, Q, are designed to be revolved by contact with the plants. 
The ends of the cylinders, Q, are provided with ring-tlanges, R, to which are attached 
the ends of a number of rods, 8, to strike against the plants and revolve the said cyl- 
inders. The rods, 8, prevent the surfaces of the cylinders from being wet by moist- 
ure from the plant-, which would cause the powder to stick to them and thus clog 
the discharge holes. 
''The two sifting-cylinders, as well as the sprinkler, project of course on each side 
of the plow and di tribute the poison on the two adjacent rows between which the 
plow is drawn. 
•'In practice it is found that the weight sinks the plow too deep, and to prevent 
this a large sliding-block is attached to the cultivator legs.''— Bulletin No. W. 
llKriPRocATiNci-STiRKKR SiPTKiis. — Id these t hi' stirrer lias a back- 
and forth movement upon the stationary sieve face to work the powder 
through. 
u Tke Willie Duster.— Mr. William T. Willie, of Brenham, r lV\., lias 
obtained a patent (No. 160086, March Hi, 1875) for a contrivance w hich 
is bnt a modification of the method mentioned above of the application 
of the poison by a man on horseback by means of two sieves fastened to 
each end of a stick and carried across the saddle* The invention eon- 
gigte of two boxes suspended on a transverse bar, and made adjustable 
vertically and laterally according to the height of the plants and the 
width of the rows. The poison is dusted on t WO r0W8*0f plants DJ means 
of a system of vibrating sie\ es a! tin' bottom of the boxes. The appa- 
ratus is intended to be seemed to a riding saddle in front of the rider. 
"Plate LVIII, Fig. 4, represents a sectional view ot* the machine, the central figure 
showing a detailed section of one of the sift ing-boxes. 
"The letters A A designate two boxes of any suitable capacity, \\ h i ili are constructed 
with two fixed seives, }> p. and movable sieves, //, arranged Between the fixed sieves 
and supported upon rods, so as to slide freely when the boxes are vibrated and aid in 
pulverizing tin* material, ami at the same time scattering it uniformly. The upper 
sieves, p, will support the bulk of the material free from the scattering sieves. j> . Kach 
box has secured to it a suspension-standard, B, having a number of holes, a, through 
it, arranged one above another, and adapted to receive suspension-pins, be, and allow 
the boxes to be adjusted vertically for high or low plants. C designates a bar, from 
which rises a guide-rod, C. This bar, C, is Intended to be secured by the middle of its 
length to the saddle, and through its ends holes are made through which the stand- 
ards, B B, are passed and sustained by means of the pins, c c. Supplemental holes are 
made t hrongh the bar, C, to allow the boxes. A A, to be adjusted for rows of plants va- 
rying in width. D designates a bar, the ends of which are slotted longitudinally to 
receive the standards, B B, and at or near the middle of the length of this bar, D, a 
hole is made to receive freely through it the rod, C. The ends of bar, D, are note lied 
at, n, and are attached to the standards, B B. by fitting these notches over the pins, 
b, as shown in the figures." — Bull. 3. 
Rotary-Stirrer Sifters. — With these the stirrer is rotated upon 
the stationary sieve-face to work the powder through. 
The J. W. Young Duster, patented (So. 188219) March 6, 1877, 
by Mr. dames W« Young, formerly of Southtield, Mich., uow of Saint 
