178 MANUAL OF PACK TEANSPOETATION. 



Now gain for 'locking" bar, 1 inch wide and one-sixtecntli of an 

 inch deep, 19| inches long, spaced equally distant from each end, 

 exactly similar as that provided in locking bar for saddle bar. 



LocMng har for hoot bar. — To be of sheet brass 19 inches long, 1| 

 inches wide, and one-sixteenth of an inch thick (gauge 16). 



Locking bar for boot is spaced off in similar manner as that pro- 

 vided in locking bar for saddle bar and turned at right angles so as to 

 fit snugly against the wall of gain. It will be noted that while the 

 portion fitting into gains in saddle bar faces downward, that supplied 

 in boot bar faces upward. This leaves a space or portion of tlu-ee- 

 fourths of an inch extending over gains the length of locking bar. 



Now supply one hole at center of each space to receive flathead 

 brass screws three-fourths of an inch. No. 6, and screw down to boot 

 bar. 



All holes on brassing must be countersunk to receive screws. 



Boot bars to be shaped on both sides, right and left, as per sample 

 furnished. (Designed by H. W. Daly.) 



HICKORY RIBS. 



(19) To be of sound second growth straight-grained hickory, free of 

 knots or other blemishes; 23 inches long, 1 inch wide, and tliree- 

 eighths of an inch thick for 60-inch aparejos; 24 mches long for 

 62-inch aparejos, and 22 inches long for 58-inch aparejos. 



In a half set of nine ribs, the third has a taper of 8 inches at its 

 upper end, thickness at end to be three-sixteenths of an inch; for the 

 fourth, fifth, sixth, seventh, eighth, and ninth, successively, a gain of 

 2 inches in the taper is provided. 



On one side at bottom and 2 inches therefrom, numerals indicating 

 the size of the aparejo, with number of rib, will bo stamped thereon, 

 a hyphen or dash to be used in separatmg the number of ribs from the 

 number of aparejo. 



In numbering the set of nine ribs, commence with the two that are 

 not tapered; these to be numbered 1 and 2 each. 



Two half sets of nine ribs each comprise a complete set for one 

 aparejo. 



In lots of 50 sets, 25 to be 23 inches long; 13 to be 24 inches long, 

 and 12 to be 22 inches long, respectively. 



All work to be done in a first-class and accurate manner. 



(20) Hay to be free of joints, or what is known as "swamp" hay; 

 that is, fine, soft, elastic hay, and for each aparejo 6 pounds wiU be 

 considered sufficient. 



ALUMINUM CASTINGS FOR BOOTS AND SADDLE BARS. 



(21) In lieu of the spaces (wood) between gains on boot and saddle 

 bars, the spaces or separators, wood may be removed, the gain ex- 

 tending from front to rear between shoulders on boots and saddle bars, 

 depth of gain to be 1 inch, depth of gain on shoulders, for key bar 

 of saddle bars to be three-fourths of an inch wide and one-fourth 

 of an inch deep; this for the key bar to pass between slots as pro- 

 vided on aluminum castings for saddle bars; aluminum castings for 

 boot and saddle bars are provided with nine spaces for ribs of frame. 



