SPIKES

Size Under Average For Rail Kegs per

Head per Keg Weighing Mile

6 × 9-16 320 75 to 100 lbs. 32

5½ × 9-16 375 52 to 75 " 30

5 × 9-16 400 45 to 60 " 26

5 × 1-2 450 35 to 45 " 23½

4½ × 1-2 530 25 to 40 " 20

4½ × 7-16 680 25 to 40 " 15½

4 × 1-2 600 20 to 35 " 17 2-3

4 × 7-16 720 20 to 35 " 14¾

4 × 3-8 1000 16 to 30 " 10½

3½ × 1-2 800 16 to 25 " 11

3½ × 7-16 900 16 to 25 " 12

3½ × 3-8 1190 12 to 20 " 9

3 × 3-8 1240 12 to 20 " 8½

2½ × 3-8 1342 8 to 16 " 7⅛

Seattle Car & Foundry Company, Catalogue No. 3, December, 1913 · 第 128 / 130 题