The general layout of the plant is shown on [Plate XXX]. It consisted of a No. 6 and a No. 8 Austin crusher, driven by an Amex, single-cylinder, horizontal, steam engine of 120 h.p., and was capable of crushing about 225 cu. yd. of stone per 10-hour day. The crushers and conveyors were driven from a countershaft, in turn driven from the engine by an 18-in. belt.
TABLE 4.—Cost of Operating the One Plant for 24 Hours During Concrete Lining.
| No. | Labor. | Rate per day. | Amount. |
|---|---|---|---|
| 2 | Engineers | $3.00 | $6.00 |
| 2 | Firemen | 2.50 | 5.00 |
| 2 | Pumpmen | 3.00 | 6.00 |
| 1 | Foreman Electrician | 6.00 | 6.00 |
| 1 | Electrician | 3.00 | 3.00 |
| 1 | Laborer | 2.00 | 2.00 |
| Total per day | $28.00 | ||
| Total for 30 days | $840.00 | ||
| Supplies. | |||
| Coal (14 tons per day) | $3.15 | $44.10 | |
| Oil (4 gal. per day) | 0.50 | 2.00 | |
| Water | 13.00 | 13.00 | |
| Other supplies | 2.00 | 2.00 | |
| Total per day | $61.10 | ||
| Total for 30 days | $1,833.00 | ||
| Total cost of labor and supplies for 30 days | $2,673.00 | ||
The process of crushing was as follows: The stone from the pile was loaded by hand into scale-boxes which were lifted by two derricks into the chute above the No. 6 crusher. One derrick had a 34-ft. mast and a 56-ft. boom, and was worked by a Lidgerwood steam hoister; the other had a 23-ft. mast and a 45-ft. boom, and was worked by a "General Electric" hoist. All the stone passed first through the No. 6 crusher, after which it was lifted by a bucket conveyor to a screen, placed about 60 ft. higher than and above the stone bin. The screen was a steel chute pierced by 2½-in. circular holes, and was on a slope of about 45°; in order to prevent the screen from choking, it was necessary to have two men continually scraping the stone over it with hoes. All the stone passing the screen was discharged into a bin below with a capacity of about 220 cu. yd. The stone not passing the screen passed down a diagonal chute to a No. 8 crusher, from which, after crushing, it was carried back by a second bucket conveyor to the bin, into which it was dumped without passing a screen. The No. 8 crusher was arranged so that it could, when necessary, receive stone direct from the stone pile. The cars in which the stone was removed could be run under the bin and filled by opening a sliding door in the bottom of the bin. A track was laid from the bin to connect with the contractor's surface railway in the Weehawken Shaft yard, and on this track the stone could be transported either to the Weehawken Shaft direct, for use on that side of the river, or to the wharf, where it could be dumped into scows for transportation to New York.
The cars used were 3-cu. yd. side-dump, with flap-doors, and were hauled by two steam Dinky locomotives.
The average force employed was:
| 1 | foreman | @ | $3.00 | per | day. | Supervising. |
| 24 | laborers | " | 1.75 | " | " | Loading scale-boxes for derricks. |
| 4 | laborers | " | 1.75 | " | " | Feeding crushers. |
| 2 | laborers | " | 1.75 | " | " | Watching screens to prevent clogging. |
| 1 | engineer | " | 4.00 | " | " | Driving steam engine. |
| 2 | engineers | " | 3.50 | " | " | On the derricks. |
| 1 | night watchman. | Watching the plant at night. | ||||
Owing to the constant break-down of machinery, chutes, etc., inseparable from stone-crushing work, there was always at work a repair gang consisting of either three carpenters or three machinists, according to the nature of the break-down.
The approximate cost of the plant was:
| Machinery | $5,850 |
| Lumber | 3,305 |
| Erection labor | 3,999 |
| ———— | |
| Total | $13,154 |