CANVAS-BACK. 287 



T. A board or frame attached to g by leather hinges. 



G. Another board or frame, secured to the deck by strong iron hinges. 



H, H, H, H, H, H, H, H. Leather hinges, securing the frames (on which the 

 canvas is tacked) to the platform or deck. 



I, I. Wrought-iron hinges, constructed with arms, so as to allow the end- 

 wing to fold over the side-wings, which are first drawn in upon the deck 

 when the battery is to be removed from its position. 



K, K, K, K. Ropes extending from the extremities of the frames, and to 

 which the canvas is also attached: this arrangement permits the wings to be 

 folded more readily upon the deck. 



L, L. Points at which a rope is passed through the carlings supporting the 

 deck, to the middle or bight of which rope the cable of the head-anchor is 

 attached. 



M. Point at which the foot-anchox is attached to the carling supporting the 

 deck. 



Having given, we trust, a satisfactory explanation of the model, 

 we will now proceed to give some special instructions as to the 

 building of the battery. The timber most usually employed is 

 one-inch white pine, except in the case of the head and foot of 

 the box, which should be made of two-inch oak, or some other 

 hard and durable wood. The side-boards and bottom of the box 

 are attached to the head and foot; and the strength of the box, 

 as well as the deck, is in a great measure dependent upon these 

 oaken timbers. 



The carlings, or small beams which support the platform or deck, 

 are also made of oak, one and a half inch thick, five inches wide 

 in centre, reduced at their extremities to one and a half inch, and 

 secured to the ends and sides of the box by means of screw-bolts 

 or large wrought nails. 



The length, width, and depth of the box must of course be 

 proportioned to the size of the shooter; for an ordinary-sized 

 individual, the following dimensions are amply sufficient : — 



PEBT. INCHES. 



Length of box 6 3 



Depth " 1 IJ 



Width " at top 2 



Width " at bottom 1 8 



Length of platform or deck 12 



Width " " 7 



Width or height of rims of sheet-lead 4 



