A. J. Cropp, Concrete Machinery, Chicago, Ill.
| Mixer number. | No. 0. | No. 1. | No. 2. | No. 3. | No. 4. |
| Size batch, cu. ft. | 7 to 8 | 10 | 13 | 16 | 20 |
| Cap. per hr., cu. yds. | 15 | 20 | 25 | 30 | 40 |
| Speed, revs. per min. | 12 | 10 | 10 | 10 | 10 |
| Weight on Skids: | |||||
| With engine, lbs. | 1,375 | 1,650 | 1,700 | 1,975 | 2,100 |
| With eng. and boiler, lbs. | 2,575 | 2,950 | 3,000 | 3,775 | 3,900 |
| Weight on Wheels: | |||||
| With engine, lbs. | 1,775 | 2,050 | 2,200 | 2,475 | 2,600 |
| With eng. and boiler, lbs. | 2,900 | 3,350 | 3,400 | 4,250 | 4,350 |
| Engine: | |||||
| Size cylinder, ins. | 4×4 | 5×5 | 5×5 | 6×6 | 6×6 |
| Rated horsepower | 3 | 5 | 5 | 7 | 7 |
| Boiler: | |||||
| Size inside | 24"×4' | 24"×6' | 24"×6' | 30"×6' | 30"×6' |
| Rated horsepower | 4 | 6 | 6 | 9 | 9 |
| Out. dimensions on skids | 40" | 40" | 40" | 48" | 48" |
| Total height | 50" | 56" | 56" | 56" | 62" |
| Height fr. ground on trucks: | |||||
| Charging, ins. | 20 | 20 | 20 | 20 | 20 |
| Discharging, ins. | 30 | 30 | 30 | 30 | 30 |
Table XXIX—Sizes, Capacities and Horsepowers of Chicago Concrete Mixers.
Chicago Concrete Machinery Co., Chicago, Ill.
| Number of mixer. | No. 00. | No. 0. | No. 1. | No. 2. |
| Standard charge in cu. ft. cement | ½ | 1 | 1 | 2 |
| " " Sand | 1½ | 2½ | 4 | 8 |
| " " stone | 3 | 5 | 8 | 16 |
| Total unmixed batch in cu. ft | 5 | 8½ | 13 | 26 |
| Mixed concrete per batch, loose in cu. ft. | 3½ | 6 | 9 | 18 |
| Cubic yards of unmixed material per hour, 45 batches per hour | 8 | 14 | 21 | 42 |
| Cubic yards of mixed concrete per hour, 45 batches per hour | 6 | 10 | 15 | 30 |
| Minimum horsepower required | 2 | 4 | 6 | 8 |
| Revolutions of driving pulley per min | 200 | 190 | 185 | 170 |
| Revolutions of drum per min | 20 | 18 | 15 | 13 |
| Diameter and face of driving pulley | 20×3½ | 20×4½ | 24×5½ | 28×6½ |
| Weight: | ||||
| On skids with pulley, lbs. | 1,550 | 2,150 | 2,900 | 4,850 |
| On truck with pulley or gears, lbs. | 1,800 | 2,550 | 3,500 | 5,150 |
| On skids with st. engine only, lbs. | ... | 2,400 | 3,400 | 4,600 |
| On truck with st. engine only | ... | 2,900 | 4,000 | 5,300 |
| On skids with st. eng. and boiler, lbs. | ... | 2,800 | 4,700 | 6,000 |
| On truck with st. eng. and boiler, lbs. | 2,400 | 4,200 | 5,750 | 7,850 |
| On skids with gasoline engine, lbs. | 2,000 | 3,500 | 5,000 | 6,500 |
| On truck with gasoline engine, lbs. | 2,400 | 4,300 | 5,800 | 7,800 |
Table XXX—Sizes, Capacities and Horsepowers of Koehring Mixers.
Koehring Machine Co., Milwaukee, Wis.
| Mixer number. | No. 0-B. | No. 1-B. | No. 2-B. | No. 3-B. |
| Capacity per charge, in cu. ft | 7 | 11 | 22 | 27 |
| Capacity per hour in cu. yds | 7 | 14 | 25 | 30 |
| Horsepower, steam engine | 4 | 6 | 8 | 10 |
| Horsepower, steam boiler | 5 | 8 | 10 | 14 |
| Horsepower, gasoline engine | 4 | 6 | 10 | 12 |
| Horsepower, electric motor | 5 | 6 | 7½ | 10 |
| Speed of drum | 20 | 17 | 15 | 15 |
| Speed of intermediate shaft | 132 | 108 | 75 | 75 |
| Weight of mixer on skids | 1,800 | 2,800 | 5,200 | 5,500 |
| Weight of mixer on skids, with steam eng. | 2,300 | 3,550 | 6,500 | 7,000 |
| Weight of mixer on skids, with steam engine and boiler | 3,300 | 5,000 | 8,000 | 9,300 |
| Weight of mixer on skids, gasoline engine and housing | 3,000 | 4,400 | 7,500 | 8,600 |
| Weight of trucks with pole | 400 | 600 | 850 | 950 |
| Weight of automatic loading bucket complete | 500 | 700 | 1,000 | 1,100 |
| Weight of mixing through complete | 200 | 250 | 400 | 400 |