A concentrate sprayer for experimental use


Material Information

A concentrate sprayer for experimental use
Physical Description:
2 p. : ill. ; 27 cm.
Johnson, George V ( George Victor ), 1910-
United States -- Bureau of Entomology and Plant Quarantine
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine
Place of Publication:
Washington, D.C
Publication Date:


Subjects / Keywords:
Spraying equipment   ( lcsh )
federal government publication   ( marcgt )
non-fiction   ( marcgt )


General Note:
Caption title.
General Note:
General Note:
"August 1948."
Statement of Responsibility:
George V. Johnson.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030361409
oclc - 783268575
System ID:

Full Text
August 1948 ET-260

United States Department of Agriculture
Agricultural Research Administration
Bureau of Entomology and Plant Quarantine


George V. Johnson
Division of Truck Crop and Garden Insect Investigations

In connection with experimental work on control of the tomato fruit-
worm (Hellothis ainera (Hbn.)) at Columbus, Ohio, a sprayer was needed
f or the application of small measured volumes of concentrated uemlsions.
A Noo 28 DeTilbiss atomizuer was modified as described herein to provide
good coverage of Individual tomato plants in field plots with 1 to 2 ml.
of spray. To assist in obtaining coverage and to control spray drift,
the plants were covered with an adjustable cage during the spraying oper-

Description of Sprayer

The glass reservoir of the atomizer was replaced by a *-inch bottom
section of a test tube 3/4 inch in diameter (fig. 1,A). The test tube
section I's attached to the metal top of the atomizer with sealing wax.
The liquid supply tube (3) consisted of a piece of 1/8-inch copper tub-
ing soldered to the metal screw top of the original glass supply tube,
and cut barely to clear the bottom of the test tube reservoir. A piece
of 3/8-inch brass tubing 8 inches long (c) was bent as indicated and a
hole (D) made to receive the atomizer nozzle extension rod. A piece of
brass tubing of a diameter to fit closely inside the air tube (C) was out
about 3/4 inch long. This piece (H) was soldered in place after it had been
filed on one end to form four prongs, which were bent inward to make a guide
for the atomizer nozzle extension rod. The junction (D) was soldered after
the atomizer nozzle was adjusted so that it was 1/32 to 1/lb inch in from
the end, and on the axis of the air tube (C). A, 3/lu-inch hole (F) was
bored in the air tube (C) and a piece of 1/8-inch copper tubing soldered
in place between the hole and the bulb end of the atomizer (G). The brass
disk (Z) was soldered in place after the orifice of 7/32 inch was deter-
mined by trial.

Operation of Sprayer

A 2-cylinder air compressor of the paint-sprayer type, set at 17
pounds pressure and powered by a small gasoline engine, supplied the air
for spraying. An air line with a cut-off valve connected the compressor
and the sprayer. Air entered the sprayer at J and divided at F. Part
went through the atomizer and delivered the spray at the outlet 3. and the
remainder passed through the air tube C and joined the atomized spray at
the outlet. Should the orifice in the disk I be too large, or air pressure


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3 1262 09240 9415

too low, insufficient afr will be forced through the atomizer to produce
the spray at B. Should the orifice be too small, insufficient volume of
air will be delivered by the sprayer to obtain good spray coverage. The
liquid reservoir A may be calibrated, or previously measured volumes of
the eunlsion may be placed therein.


J[ C ^^ H
1 ---- ^t--SSCT --^- ^ ^ - --- ..^ E

Figure 1.-Diagram of concentrate sprayer with cutaway
view of nozzle end.