192 MANUAL OF PACK TRANSPORTATION. 



opening for distance board to be 2^ inches long by three-fourths of an 

 inch wide. In forming opening an extension is allowed on this end to 

 form a hook on the outward face of opening, and is arranged in this 

 manner : 



Commence at end selected and measure off three-fourths of an inch 

 and mark with punch on each edge; in similar manner mark off one- 

 half of an inch, then 2i inches, 3^ inches, and three-fourths of an 

 inch. This gives 8 inches marked off on end, to form opening and 

 hook on end of side plate, and will be considered the lower end of side 

 plate. 



In forming hook, it is well to commence at end. To do so, com- 

 mence at the second line of markings If inches from end; turn this 

 portion at right angles, and three-fourths of an inch from end turn 

 again at right angles. 



Now, on the space marked 2 J inches form a hook, depth of hook to 

 be 1 inch; mouth of hook to be five-eighths of an inch wide. Now 

 bend or compress sufficient of the space marked 3 J inches, so as to be 

 flush with under and forward surface of hook; and at markings turn 

 at right angles, and at last markings turn again at right angles. This 

 forms the opening for the distance board, whose inside dimensions will 

 be 2 J by three-fourths inches. This should leave the extension of 

 side* plate 24^ inches long. 



It will be noted, in the formation of opening for distance board, 

 there is an angular opening on the under surface in the formation of 

 the hook; the base of this opening should be not less than three-fourths 

 of an inch. 



In the formation of hooks on the hook plates, these openings are 

 utilized by the locks or holdfasts provided on legs of platforms, to 

 hold platforms securely. 



Hook plates for side plates (4) ■ — Hook plates to be 44 inches long and 

 in their formation 7 hooks will be provided, arranged in the following 

 manner : 



Commencing at one end, space and mark off with punch on each 

 edge, the following distances: 



Three inches from end selected mark and punch; then If inches 

 further in similar manner; then 1^ inches; and then 6 spaces of 5| 

 inches each; this leaves 3f inches at opposite end for the outward por- 

 tion of last hook on hook plate. 



Now commence at first, or top end of hook plate, and at space 

 whose distance is If inches, cut out a section on each side of three- 

 eighths of an inch wide; this leaves three-fourths of an inch at center. 

 Now lap the end over at center of this space to form eye for bolt of 

 hinge, d!^iameter of eye to be one-fourth of an inch. 



The 3-inch laps will be considered the under side of hook plate, and 

 are to receive the distance plates of frame. 



Now on the space of 1^ inches, form a hook whose depth wiU be 

 three-fourths of an inch, mouth of hook to be five-eighths of an inch 

 wide. 



On the remaining six sections marked off, form hooks, whose depth 

 will be 1 inch; mouth of hooks to be five-eighths of an inch wide. In 

 the accurate formation of the hooks a templet is good for the purpose; 

 hook plates to be as per sample furnished. 



In assembling hook plates to side plates, the free end of side plates 

 engages into the fold of hook plates, and to meet the shoulders of 



