A dust gun for laboratory experiments with insecticides

MISSING IMAGE

Material Information

Title:
A dust gun for laboratory experiments with insecticides
Physical Description:
2, 1 p. : ill. ; 27 cm.
Language:
English
Creator:
Harries, F. H
United States -- Bureau of Entomology and Plant Quarantine
Publisher:
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine
Place of Publication:
Washington, D.C
Publication Date:

Subjects

Subjects / Keywords:
Spraying equipment   ( lcsh )
Spraying and dusting in agriculture   ( lcsh )
Genre:
federal government publication   ( marcgt )
non-fiction   ( marcgt )

Notes

Abstract:
The equipment described herein was designed for applying small weighed quantities of derris and pyrethrum dusts according to a technique employing a spray gun that was used previously in testing liquid preparations of the same materials. The apparatus was operated by compressed air and consisted of a dust-delivery mechanism mounted on a common type of laboratory spray gun for the purpose of utilizing the air-valve control lever of the sprayer.
General Note:
Caption title.
General Note:
"ET-180."
General Note:
"September 1941."
Statement of Responsibility:
by F.H. Harries.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030351566
oclc - 781854835
System ID:
AA00023101:00001

Full Text
L1W~ ARY
~

ET-180


September 1941


United States Department of Agricultiire
Bureau of Entomology and Plant Quarantine


A DUST GUN FOR LABORATORY EXPERIMENTS WITH INSECTICIDES

By F. H. Harries, Division of Truck
Crop and Garden Insect Investigations




The equipme.-nt described herein was deoigne r applying
small weihed4 uar; ities rf derris and pyret&ru, acording to
a technic employi g a pr iy gun that was uselu p ioul in testing
liquid preparatc of the same materials Th opu.patus was
operated by compressec air and consisted of a ue very mech-
anism mounted a cenrnon type of laborat iry spra go for the
purpose of utilizing the air-valve control .evr of the sprayer
(fig. 1, A). This assembly was connected to g valve and
pressure gauge on a compressed-air line by a e2 air hose.


The dustr attahment (B) consisted of a
tube mounted on a cy 'nd(rtcal housing cona:
wheel and a fine- octbcd disc. The dust del-,r
two short sections of i/4-inch brass pipe jo .
attached to th dust cylinder. The dust cyf
in diameter an 3/4 of an inch in length .
lathe from a large brocze bearing. The 1
cylinder was out s'! ghtly larger for a dist
an inch from one end, and a tightly fittig.g
was pressed in against the flange formed h
dianeter and sc -r- -n place to form a patt
diameter was al. uf ':Ji.ghtly larger for a
of an inch from each end of the cylinderc
receiig th~e f< I ac cover plates (D
tle cas of Ic L cylinder were made of
were he].d in p!ro. J y nuts or the end of a,
placed through the center of the housing.


I delivery
an air-driven
as made of
by a brass tee
a~~ 3-1/2 inches
alioned on a
d er of the
out 3/8 of
hoe copper
erence in
The inside
langes for
closing
e opper and
Steel shaft


The wheels v r made from discs of s > opper and were
mounted on a bron s ;eeve or bearing fitted tofeely on the
steel shaft. The sleeve extended through a : ,f slightly larger
diameter in the par itia ,.d was equipped vii t-i threads for
mounting the toothed woees. These were c. p r ~ dly to the
sleeve on opos te sies of the diaphragm by reans -I thin lock
nuts on both sides et each disc. Small vanes were a oned along
the edge of the drive wheel (C) by cutting in about 1/4 of an inch







-2-


at 1/8-inch intervals and twisting these seco at r ales
to the plane of the disc, Teeth of the dust wheel (E) were ade
n the same way, Pxoept that the cuts were j, s
at 1/16-inch intervals to give the sections a sight tv' is and
roughen the edge of the disc.

Two small copper tbes. fastene with so dr passed through
a plug n the del very 1ube to divide the air sreat
tubes was led through sira] hole in the tep f the cylinder and
was bent to direct the compressed air aga inst the b a of the
]rive wheel. Holes ,rere cut in the lack plate ( ) x per ~iascape
,f the air. The other ti he was extended Je"yoi the t3ras tce in
the Ieldvery tube to proc Vice r suction a th op o the dust cham-
her, where air was admitIed through two saY Ioles bed "r th
,u-i4 (F) The erd of this tube ..as, solder or and then
partially opened with a needle to make a s-raller ope:i g, ,o that,
the greater portion of the air would pass throuh the other tube
and be used in spinning the wheels.

The insecticidal dust vas in trodned tVr ugV a hole in the
-,,,(t ate hati was ( p y 1o rwirg ae The dust was
carried upward on th teth e the disc and by the agitation the
-r produced by revcJr- 4 t V the dust, whe:t, then it was taken
r .gh the brass tec J, o the delivery tube by suction and expelled
ly compressed air. I was apparently unnecessary to clean the
reservoir or dust cha '.er between operatio- hut he cleaning
could easily br done by remo.vi g the front p. h-
A slight residue vias left in the delivery tube after applying each
dust charge, and this was removed with a snall bush The rate of
duse delivery was regulated by ajusting he reduoing valve to
:e ,ermine the pressure of the compressed airtrol also
permitted the delivery of dusts of different physca[ properties
a abott the same rate The present apparaV gave a more complete
rieper :al and more ui form delivery of the ci re dust charge tian
other types of equipment tested.






SIDE VIEW OF GUN


Be


CROSS
SHOW


ASSEMBLY


SECTION
ING DETAILS


:DRIVE
WHEE







D.
BACK
PLATE
HOLES
FOR ESC


E.
DU
WH


-(0


m m
rn r-
r F.

FRONT
PLATE
CAP


ST
EEL


LOCATION OF
HOLES FOR
ADMI TI NG
AIR


Figure l.--Diagram of the dust gun showing details of construotion.


A.




UNIVERSITY OF FLORIDA

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