MANUAL OF PACK TRANSPORTATION. 215 



5. Metal squares for coupling plxites of hinges (4). — For squares pro- 

 vide four |-incli brown japanned buckles, and remove the t<)n(]i;ues; 

 now su])})ly four sections of sheet steel same ji:au<;e as cou])lin(::; ])late, 

 2 inches loni^ and three-fourths of an inch wide; fold each section so 

 that ends will meet, and lay into fold the metal scpiare; provide one 

 hole in the center of each section, and three-fourths of an inch from 

 bar of square held in fold of section, diameter of hole, three-sixteenths 

 of an inch; now introduce the folds of section on the downward edge 

 of coupling plate, flush w4th the bar of square, and 1 inch from the 

 inward edge of hinge to center of square, provide a corresponding 

 hole on coupling plate and rivet down securely. 



These to receive straps of leather bags of frame. 



6. Wooden stiffeners for coupling plates of hinges (2). — To be of 

 sound hickory, free from knots or other blemishes, 17 inches long, 3 

 inches wide, and seven-eighths of an inch thick, shaped in this man- 

 ner: Three and three-eighths inches from each end saw down on one 

 side three-eighths of an inch, and "gain" out this portion, between 

 cuts. This leaves one-half of an inch in thickness on the bottom 

 side of stiffener, the gained surface to be smoothed off, and the upper 

 and the lower edges to be well rounded. This to receive cincha of 

 aparejo (pack saddle). 



Now place stiffener on the upper side of coupling plate, between 

 hinges, keeping their edges flush, and provide two holes, through 

 stift'ener, at each end, corresponding with those on coupling plate, 

 and secure rivets and burrs (malleable iron). Introduce rivet and 

 burr from upper side of stiffener and rivet down on under side of 

 coupling plate. 



Now provide 6 screws, one-half of an inch. No. 6, and screw down 

 to stift'ener as provided. 



Stiftener holding plate to be covered with fair leather, and sewed 

 down w4th one seam, 6 stitches to the inch, seam to be flush, with, 

 lower edge of coupling plate. 



7. Side plates for hinges (4). — To be made of sheet steel, 30 inches 

 long, 2^ inches wide, and three thirty-seconds of an inch thick (gauge 

 14), shaped in this manner: At one end, and 1^ inches therefrom, 

 fold this portion back, so as to take a ^^-inch bolt, and secure with 

 two rivets; for rivets provide two holes iihree-sixteenths of an inch 

 diameter, one-half of an inch from each edge, and three-fourths of an 

 inch from end of folded portion, countersink holes on under side of 

 plate, and rivet down. Now cut or saw out in entirely similar manner 

 as that described for first section of hinge, provide bolt, and rivet 

 down to end of hinge. Now measure 20 inches on the free end of 

 side plate, counting from center of bolt on end of hinge, and turn at 

 right angles. Next provide a "templet," shaped in this manner: 

 Take a section of flat iron 3 inches long, 2h inches wide, and 1^ inches 

 thick. On one side at end bevel or taper to a thickness of five-eighths 

 of an inch, the beveled end will be considered the bottom, and the 

 tapered side the outer face of templet. 



Now place templet on the angle formed on the free end of side 

 plate, and secure templet to side plate, and fold the free end around 

 templet, lapping the remaining portion upward on side plate. Next 

 provide two holes, three-sixteenths of an inch diameter, one-half of 

 an inch from each edge, and free end of side plate, holes to be counter- 



