Two convenient and easily stored knock-down cages for laboratory and field studies


Material Information

Two convenient and easily stored knock-down cages for laboratory and field studies
Physical Description:
Magner, J. Marshall
Blanchard, Ralph A
United States -- Bureau of Entomology and Plant Quarantine
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine ( Washington, D.C )
Publication Date:

Record Information

Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 30346921
oclc - 781641617
System ID:

Full Text

tTA fit t November 1940

United States Department of Agriculture Bureau of Entomology and Plant Quarantine



By J. Marshall Magner and Ralph A. Blanchard, Division of Cereal and Forage Insect Investigations

During the course of the corn earworm investigations being
conducted at Urbana, Ill., two simple knock-down cages were developed which could be constructed easily and inexpensively in a short.
time. These cages have proved so useful, that description of them
seems warranted.

The first cage is 12"1 x 12"1 x 12" in size and is composed
of a series of frames (fig. 1) made of 3/4! x 3/4"1 white pine, fastened together by threepenny wire finish nails. All the frames
except the front one have 14-mesh galvanized screen wire tacked on the face toward the inside of the cage. The cage proper is
held together by 1-1/4" No. 7 flat-headed wood screws; it can therefore be taken apart quickly for transportation from one locality to another or in order to save storage space during the winter months (fig. 2). The corresponding parts of" separate cages are constructed alike so as to be interchangeable. The outside
dimensions of the particular cage described are, as stated, 12"1 x 12"1 x 12"1, but the same general desigPn may be iised for cages of
different dimensions,

The cage is composed of seven frames with the following

Top and bottom 2 12" x 12",

Front and back 2 12"1 x 10",

Sides 2 10-"' x 10"

Door 1 1L x 91

In assembling the cage, two screws are plaoed through
each of the two uprights on the front and back frames into the uprights of the side frames; two each through both the top and bottom frames into the front and back frames; and one through
each side of both top and bottom frames into the side frames.


Hinges may be used to -hold the door to the cage, but a cheaper and in some respects more efficient method was devised. Before the cage is assembled'. two sixpenny finish nails are driven through the bottom of the front frame, 3"1 from each side, so that the pointed ends extend upward. Two holes are then drilled through the bottom of the door in order to allow the nails to slide through the frame and hold the bottom of the door firmly in place. By
drilling downward through the top of the front pieces and part way into the top of the door, a hole is made into wic an eightpenny
work nail may be slid to hold the top of the door- securely in place.

Materials and cost of one cage are as follows:

24 linear feet of 3/4" x 3/4" certified
white pine $0 40

6 sq. ft. of 14-mesh galvanized screen
wire @ 610 per sq, ft. .39

20 F, l-L" flat-head wood screws @ 50
per doz. '08

Nails and tacks .02

Total cost of materials $0.89

Labor, about .3 hours.

A second type of knock-down cage (30" x 30"1 x 30"), differing somewhat in some of its details, was constructed for use as a field cage (fig. 3). The chief advantage of this cage, like
the one described above, is the fact that it can be easily taken apart for storage or for hauling from place to place (fig. 4). While the cost of a cage of this type is somewhat more, an--d greater care i~s required for its construction, the results obtained warranted its use,. Large cages of this type which have been in use for four seasons, both in the insectary and out of doors, are still
practically as good as new as a result of their being storable in a limited space when not in use.

The cage is composed of five frames made,, of 1" x 2"1 clear western white pine and covered with 14-mesh galvanized or 16mesh copper screen wire tacked on the inner surface.

Top 1 30"1 x 30"

Small sides 2 28-3/8"1 x 28"1

Large sides 2 30"1 x 30"


The pieces which form the frames are notched on the ends to permit easier nailing and to make the frames more rigid.

Strips of 111 quarter-round 29" long are nailed on the inner
surface of each of the upright pieces of the large frames, 3/411 from the outer edge. These furnish a ledge against vhich the smaller frames rest when the cage is assembled. Quarter-round is also nailed in the same way completely around the inner surface of the top frame to hold it in place when the cage is in use and also to prevent escape of small insects- (See upper section of fig. 4.) Hooks and eyes are placed on the corners to hold the top to the cage.

The four frames comprising the body of the cage are held together by light 11" narrow butt hinges, two on each of -the four edges, In dismantling, the pins are removed from the hinges and the cage is taken apart.

Materials and cost of one cage are as follows:

50 feet of I" x 2" clear western white pine @ 20 a foot $1.00

1-L" narrow butt hinges @ 100 a. pair 80

4 flat hooks with eyes @ 50 each .20

28 sq. ft. of 14-mesh galvanized screen
wire @ 610 per sq. ft. 1.82

20 feet of quarter-round @ 10 a foot .20

Total costs for materials $4.02

If 16-mesh copper wire is used, the cost will be approximately 42 cents more, or $4.44.

Labor, about 5 hours,

With some modifications, metal could be substituted for wood in making this type of cage.

Figure l.--Small knock-down cage ready for use.

Figure 2.---Parts of small cage, assembled for
transportation or storage.

Figure 3.--Field cage ready for use.

Figure /+.--Parts of field cage, assembled for
transportation or storage.

UNIVERSITY OF FLORIDA 3 1262 09239 5366

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