December, ’18] 
YOUNG: PORTABLE INSECTARY 
477 
rest on the shoulders so formed. Four sectional screen frames form 
the side walls, each built of 2 x 4 in. spruce, having two beams 9 ft. 9 in. 
long and three beams 3 ft. 5 in. long. The shorter beams are halved 
to the inner sides of each end and middle of the long beams and fas¬ 
tened together with 2|-in. bolts, forming a rigid frame to be covered as- 
are all the other frames, with 36-in. wire mosquito netting. This m 
adjusted as follows: saw clear f-in. pine boards of suitable length into 
3/16-in. strips, plane and sandpaper on one side. Place one linear edge 
of the netting on the inner edge of the frame the long way, lapping on 
J in. and fasten in place with a strip above mentioned, using a 1-in. 
brad every 3 in. to hold firmly, nail strip on the netting down the center 
beam; next nail strip opposite the first beginning at the center beam 
and nailing towards the ends to avoid pulling screening unevenly, pull 
netting taut by gripping outer edge with pinchers (as the width of net¬ 
ting required to cover with these measurements is 2 ft. 11 in. there will 
be a margin of 1 in. left outside the strip for pulling), nail the end strips 
last, being careful to allow 1 in. outside, this may be readily trimmed 
off with a sharp knife after nailing. The two end sills of 2 x 4 in. 
spruce are 11 ft. long, halved on to the lower projecting end of side 
screen, with J in. exposed for a base on which to rest the end screens. 
All of these are fastened with 6-in. bolts to the posts which were set so 
that the bottom of sills and side screens rest on the surface of the 
ground; these should be treated with creosote. 
The floor is of earth or gravel. Fit 12 2 x 3 in. spruce rafters 7 ft. 
7 in. long, the upper end sawed at the proper angle to adjust against 
the face of ridge pole with a 2J-in. screw, the end being exactly flush 
with the top. The lower end of the rafter should have a right angle 
notch cut so that one-third of the thickness of the rafter will bear 
against the vertical side of screen and two-thirds will rest on the top, 
to give greater thickness for holding a 2§-in. screw inserted in the 
counter-sunk hole passing through the end of rafter into top of screen. 
In locations where extra strength is not required, because of mild 
climate, protected situation, or the short period during which the 
Insectary is set up in any one place, the rafters may be omitted en¬ 
tirely by using strips of 2 x 2 in. in place of the f x 2 in. stock for the two 
joists forming the outer sides of each panel frame; the roof panel being 
held in place by a bolt at the ridge and one on each side inserted into 
the top of side screen. 
The ridge should be beveled at the proper angle to make the surface 
of the panel fit closely* In case rafters are not used the interior ties 
for preventing the spread of the roof should be of 2 x 3 in. spruce and 
fastened to it by a bolt passing through an iron cleat 1 x 3 in. and J in. 
thick (in place of upper washer), down between the abutting sides of 
