-,A\IL i ,.-,.*.ir i", i United States Depar--.ent of Agriculture
Bureau of Entomology and Plant Quarantine
A HAND-OPERATED SHAEER FOR SIFTING SOIL
By F. H. Shirck, Division of Truck Crop and Garcen Insect
A portable, hand-operated shaker for sifting soil is frequent-
ly needed in the course of invest i-ctions having to do with soil
insects. Such a device should be (1) as light as >ssible in weight
to facilitate carriage in the field, (2) it should hold the sieves
high enough to be reached conveniently by a worker from a standing
position, and (3) it should be reX.ily co.:.i:slible for tr-nspor-
tation or storae. The shaker herein dccri'ed and illustrated
meets the above requirer;ei&ts and has proved s-:tisfactory under a
variety of conditions.
The construction of the shaker is shown in figure 1, and the
complete sifting apparatus set up and ready for use in figure 2.
The flexible upright piece shown in C of figure 1 is made of a flat
piece of spring steel having the dimensions 1/4" by 2" by 40".
This member is given a c.ne-quarter twist near the las, which per-
mits the sieves to be -hai.-.e, in a direction parallel to the long
arm of the wooden base, ard also allows some r.otion in a si'^ev'ise
direction so that a rotary miticn may be given to the sieges if
desired. When in use the upright piece fits into a r.etal sheath
in the base r.s sho'.n, no bolt being re-'uired to hold it. Two brack-
ets for holc'iing the sieves are L:-:.ed to the upper end of this up-
right piece. The base consists of 3 pieces of 2" by 6" lumber
hinged together with heavy strap hinges. Each of the 2 shorter
arms of this base is equipped with a metal keeper (fig. 1, K),
into which a flange of the angle iron B fits, locking the arms
rigidly in position. On removal of this bar the base folds up, as
shown in figure 3 and in A of figure 1.
j/ The drawings were made by L. V. BurchLztrn of the Parm.a, I.aho,
In sifting soil 2 sieves are oc2,inarily used, the upper one
having 6 meshes and the lower one 12 or 16 mesh3s to the inch. The
hook shown at H in figure 1 holds the lower sieve so that it does
not fall out while the soil is being placed in the screen. This
overh-nr;.-'.:. hoc:.- is important, anr... the.'e should be good clearance
so that the sie-.e slips in without binding. The sieves used have
outside measurements of 24- by 231 by 2- inches. The ur:-er sieve
r.erely sits on the lower one, no particular arrn-easnt bein- neces-
sary to !old it in position. However, the upright hook on the rear
sui-porting bracket projects slightly above the bottom siee so that
it also holds the top one.
In ch'kina the sample of soil, both sieves are i-grasped and
shaken back and forth, a motion rediJ.ly permitted by the flexi-
bility of the upright piece of steel. The v.-eight of the '.:.se is
sufficient to keep the apparatus fairly steady during the sifting,
but further stability is imparted by restinr.. a foot on the forward
end of the micdle support, as shown in figure 2. The top sieve is
set aside after the soil has passed thi'xu.h it, c.nd sifting is
completed by use of the lower sieve.
A s-sample of 12 quarts of soil may be h-.n.led at one time,
and one man can sift and e:;ariie about 10 such samples per hour.
The co..,n,:ete e:iuipn.rjent, consisting of a post-hole auger for -igging
the samples, the shaker, and the sieves, may be carried frcLT place
to place in the field by one T;,;.n The z-h:.er is not knocked down
betv.eei :lo'.'es in the s-ir.e field, but the sieves are removed.
.. ... .- B..........
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SHAKER FOR SIFTING SOIL
Figure 1.-Details of the hand-operated soil sifter.
Figure 2.-Soil sifter in use.
. i '!t" -X ..'.
AFigure 3.--Shaker (folded) andsieves.
Figure 3.-Shaker (folded) and'sieves.
UNIVERSITY OF FLORIDA
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