Laboratory spraying and washing apparatus


Material Information

Laboratory spraying and washing apparatus
Physical Description:
Mixed Material
Chisholm, R. D
United States -- Bureau of Entomology and Plant Quarantine
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine ( Washington, D.C )
Publication Date:

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All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030345283
oclc - 781633954
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ET-149 June 1939

i. -...I .t ite? Depa rL;.,.',.t of Agiricultur-,
E..'eau of E:omolo.y and Plant Quaran.tine

..-..:h. >:.,j,, SFRAYING "; ,',.*P..W lI,;,; APPARATUS

By Robert D. C.if;=,olm,
D v ciK.:. of Il'sejtici., i.'.'cstigatio.l

In the study of spray residues under laboratoi ,' conditions
it is .e .--.y to have a ca,-L., whereby the sprays may be .1: lied
on pla:.ts, -" plates, and other surfaces and also a means for
simula'l 1.. e .--'Yi!,g? effect of rain. One of the methr.- often
employed for ths purpose includes the use of a paint sprowjr, which
atomizes the ';, means of compressed air. The uii .,:nt neces-
sary i j'.- .ve. considering t-c combined cost of the paint
sprayer, air c -..',ressor. and control valves. Also it is not rrdily

Appar:atus has been developed which is of low cct and is
readily portable Furthermore, it permits the use of a wide vari-
ety of spray nozzles to produce sprays of varying character and
thus more nearly duplicate spray; as they are used in the field.
The sa'.,-- *q,'it,-;!t '.ise.i -for applying spray mixtures may also be
used to simulate the washing effect of rain by merely substituting
water for -, spray mixture.

Description and Operation of Apparatus

To -..,crate the apparatus, cocks D and F are closed and cock
C is rpp,- ,:"ter which the spray mixture is poured into the
percolator (A), and the motor (G) is started. The cpray mixture
flo'.s f,-,-, the p^rcolator into the _-.-ir pump (B), from which it is
fore?:. ,-' into the bottom of the percolator thrnipi. a tube at-
tache'. to cock C This tube is closed at the end, and near its
end it h.:.- .- holes of 1/16" : eter, which are drilled at right
an-gles to a other This arrar gement produces vigorous a. station
of the .p;,y mixture and reduces ifo..,, and swirl.i,..,-' to a minimum.
By pir'ly cOS cock C the pressure in the system is incri based.
Consta:.t p,-: ..'es up to 52 pounds i. r quaree inch may be maintained
by a sl.4.'e Ojustment of cock C. Hi.-_ier pressures are obtainable
by :.:.r.. ','< the peed of the p ..p. The .p-y nozzle. (E) is
opera-.ed '.y p' :. r.g cock D. To clean the apparatus, cock F is
oper.eo "e ex spray, is ehar, 7 Th'is is followed by
sufficient clear water to remove the last trace of the --,ray


Since the capacity of the gear pump is far greater than the
output from the spray nozzle, it is evident that this apparatus is
essentially a device for the continuous removal of a portion of a
uniform flow of a spray mixture which is under constant pressure.
The device is constructed of standard parts, is portable, and may
by used anywhere that electricity is available. The type of spray
delivered may be varied through a wide range by means of changes in
the pressure, location of the spray nozzle in relation to the ob-
ject to be sprayed, and the use of various types of nozzles. In
this way sprays may be applied under hydrostatic pressure in a
manner which closely duplicates field spraying. Furthermore, the
same apparatus may be used to simulate the effect of rain on spray
residues by simply substituting water for the spray mixture.

The spraying apparatus may be used in various ways, one of
which is illustrated in figure 1. This shows a spray hood which
contains apparatus for rotating glass plates through the spray.

The spray hood is in the form of a cube with one face omitted,
each dimension being 4 feet. It is assembled from sections made of
luDin'-r 2 inches square and covered with galvanized iron. The sec-
tions are bolted together. The galvanized iron in the bottom is
in the form of a pan 4' x 4' x 2" and has a 1" pipe flange in one
corner to accommodate a drain pipe. The galvanized iron on the
sides extends on the inside to the bottom of the pan.

The device for rotating objects through the spray is mounted
on a 1" x 12" board placed diagonally in the hood. It is raised
above the pan by means of cleats in order to allow the removal of
the excess liquids through the drain. The rotating device consists
of a turntable (J), to which is attached a support (H) for a rack
(I). Power is transmitted to the turntable by a motor (K) by means
of belts and pulleys which reduce the speed of the rack to 2 r.p.m.
This speed may be varied by changes in the sizes of the pulleys.
The rack consists of eight metal rods 9 inches in length, which are
attached to the top of the support. A Parrot paper clip is attached
to the end of each rod to hold the glass plates in a vertical
position. The plates are supported in the clips by means of 3-
sided prisms, with a saw cut in the top edge into which the bottom
edge of the glass plate is fitted. The glass plates are 5" x 7"
photographic plates, with one corner ground to provide a space for
identification marks.

The support and rack may be removed and a circular table
substituted in cases Where it may be desirable to spray plates
while they are in a horizontal position or to spray potted plants
or other material.

When in operation, the pulleys, motor, and turntable are
protected from the spray by means of a metal cover.

Figure 1.-Laboratory spraying and wa-.hing apparatus.
The necessary pipes and fittings aa'e shown. The
apparatus is mounted on a portable wooden base.

Parts of apparatus for producing spray:
A. Glass percolator, 2-liter capacity.
B. Gear pump, 3/8", with 6" pulley.
C. Cock, 3/8", to control pressure.
D. Cock, 1/4", to control nozzle.
E. Vermorel spray nozzle.
F. Cock, 3/8"11, to drain apparatus.
G. Motor, 1/4 hp., 1,725 r. p. m., with 2" pulley.

Parts of apparatus for rotating glass plates:
H. Support for the rack.
I. Rack for holding glass plates.
J. Turntable.
K. Smell motor.


3 1262 08537 0863

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