79) REPORT OF COMMISSIONER OF FISH AND FISHERIES. [38] 
front and back sides by two cleats, R R, extending below the edge 
of the box and are nailed to transverse pieces, which pass across the 
i bottom from side to side. 
We Bon: Theendsare pierced by three 
MTA sets of holes to accommo- 
date the transverse bars, S, 
upon which in the interior 
are placed movable frames, 
dividing the box into super- 
imposed compartments. The 
cover is formed of thinner 
planks, D, placed side by 
side, and maintained in po- 
sition by the bar T, which 
slides into the two sockets, 
A, at the ends of the two 
stakes supporting the ends 
of the box. It is hardly nec- 
essary to add that the appa- 
ratus should be constructed 
of solid planks of a dura- 
ble wood, such as oak, and 
that the fastenings of the 
parts should be, so far as 
possible, of the same kind 
of wood, employing neither 
iron nor nails; but if their 
use is absolutely necessary, 
then the preference should 
be given to iron or galvan- 
ized nails. The frames for 
the inside are of wood, about 
4 centimeters in thickness, 
and furnished with two han- 
dles to facilitate removing. 
The bottom is covered with 
brass wire netting (Fig. 10), 
the meshes of which are 
about 2 centimeters upon a 
side, and in order to increase 
the strength of the frame and 
sustain the netting, diagonal 
wires can be run across from 
corner to corner, or a central 
bar of wood from side to side. 
These frames are made of such a size that when placed side by side, two 
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