MANUAL OF PACK TRANSPORTATION. 193 



hin^c; the opposite end of side plates engages into the free end of 

 hook phitcs, this operation gives 8 hooks on the upper or face side of 

 side plates; at the lower end of engagement one hole will he provided 

 at center through hook plate and side plate, diameter of hole three- 

 sixteenths of an inch, and riveted dow^n. At the upper end hetween 

 first and second hooks, two holes will be provided, in a diagonal line 

 in similar manner; these holes to receive side plates of frame. 



Both side plates and hook plates assembled must 'positively be in 

 straight alignment, one wnth the other. 



Distance plates. — To be 23 inches long, 3 inches wide, and one-eighth 

 of an inch thick; at each end of distance plate provide a slot 1^ inches 

 long and five-sixteenths of an inch wide. Slot to be in center of dis- 

 tance plate and one-half of an inch from each end and to be parallel 

 with length of distance plate. These slots or openings are to receive 

 staples of chock plates that hold frame to aparejo. , 



In adjusting distance plates to side plates, measure 9^ inches each 

 way from center of distance plate for side plates, from out to out. 

 This leaves 2 inches at each end of distance plate, extending from side 

 plate. The lower edge of distance plates to be flush with the lower 

 edge of the 3-inch lap as provided on hook plates. Two holes w411 

 be provided at front and rear to correspond with those provided on 

 hook and side plates, distance plates to be placed on the under side of 

 3-incli lap and riveted down. 



Distance boards or shoes, wooden (^). — To be of good, sound hickory, 

 free of knots and blemishes, and to be 19 inches long, 2^ inches wade, 

 and eleven-sixteenths of an inch thick. 



One and one-half inches from each end saw dowai to a depth of five- 

 sixteenths of an iiich on one side, portion between cuts to be "gained" 

 out in a smooth and accurate manner, the upper and lower edges of 

 ''gained" surface to be rounded off. 



Reenforced plates for sJioes {2). — To be of band steel, gauge 14, and 

 of dimensions similar to distance shoes. These to be placed on the 

 under side of distance shoes. The flat surface of shoes will be con- 

 sidered the under side. 



Reenforce plates to be secured to distance shoes by copper rivets, 

 holes being provided on gained surface of distance shoes spaced 

 equally distant, one at center and one at each end and 2 inches there- 

 from, holes will be provided on reenforce plates to correspond with 

 distance shoe, diameter of holes to be three-sixteenths of an inch. 



In assembling side plates and distance shoes it is well to introduce 

 distance shoes first, care being taken to square the side plates when 

 applying distance plates. 



Now connect side plates with hinges, using l|-inch bolts, oval head, 

 and rivet down over nut. 



At ends of side plates provide one hole at center three-fourths of 

 an inch from end, hole to pass through metal and wood, secure rivets 

 and rivet down on the uncler side. 



(2) The platforms. 



Platforms (2). — To be made of best Norw^ay iron. 

 For distance rods cut three sections of ^-inch round iron. 

 The first section to be 22 1 inches long; the second or outward section 

 to be 21 i inches long; the third section to be 20| inches long. 

 75927°— 17 13 



