Figure 80 shows the arrangement of the mixing plant. The mixer was a 5-ft. cube mixer holding 125 cu. ft., mounted on a trestle and operated by a 9×12-in. horizontal engine taking steam from a 4×10-ft. locomotive boiler, also supplying steam to two derrick engines. The material scow contained two pockets for sand, one for gravel and one housed over for cement. Two inside cement men passed out the bags in lots of six to one outside cement man who cut and emptied them into the charging bucket. Three sand shovelers each loaded a 3.6 cu. ft. barrow and wheeled them tandem to the bucket, and two gravel men each loaded a 2.7 cu. ft. barrow and wheeled them tandem to the bucket. The broken stone was loaded by eight shovelers into another bucket, also containing 21.6 cu. ft. The two buckets were alternately hoisted and emptied into the mixer hopper, there being a dump man on the mixer who dumped the buckets and attended to the water supply. A charger put the mixer in operation and when the charge was mixed the car men dumped it into a skip resting on a small car which was then run out on the track under the mixer to the derrick which handled the skip to the work. Derrick A handled the materials from the scows and derrick B handled the mixed concrete. The force on the derricks consisted of two enginemen, four tagmen and the fireman.
The ten parapet wall sections containing 841 cu. yds. were built in 46 hours, making 17 batches of 1.07 cu. yds., or 18.2 cu. yds. placed per hour. The 17 parapet deck sections containing 1,720 cu. yds. were built in 88 hours, making 18.8 batches of 1.08 cu. yds., or 19.5 cu. yds. placed per hour. For the parapet deck work the force was increased by 2 men handling materials and 1 man on the mixer. The labor cost of mixing and placing the concrete was as follows:
| Loading Gang— | Per day. | Per cu. yd. |
| 1 assistant foreman | 2.00 | $0.011 |
| 3 cement handlers | 5.25 | 0.029 |
| 3 sand shovelers | 5.25 | 0.029 |
| 2 gravel shovelers | 3.50 | 0.020 |
| 8 stone shovelers | 14.00 | 0.076 |
| 1 hooker on | 1.75 | 0.010 |
| ——— | ——— | |
| Totals | $31.75 | $0.175 |
| Mixer Gang— | ||
| 1 dumpman | $ 1.75 | $0.010 |
| 1 charging man | 1.75 | 0.010 |
| 2 car men | 3.50 | 0.020 |
| 2 enginemen at $3.25 | 6.50 | 0.035 |
| 4 tagmen at $2 | 8.00 | 0.044 |
| 1 fireman | 2.00 | 0.011 |
| ——— | ——— | |
| Totals | $23.50 | $0.130 |
| Wall Gang— | ||
| 1 Signalman | $ 1.75 | $0.010 |
| 1 dumper | 1.75 | 0.010 |
| 6 shovelers at $2 | 12.00 | 0.065 |
| 4 rammers | 7.00 | 0.038 |
| 1 foreman | 4.00 | 0.022 |
| ——— | —— | |
| Totals | $26.50 | $0.145 |
| Grand totals | $81.75 | $0.450 |
Fig. 81.—Concrete Blocks for Pier at Port Colborne Harbor.
Fig. 82.—Forms for Molding Blocks, Port Colborne Harbor Pier.
Fig. 83.—Device for Handling Blocks, Port Colborne Harbor Pier.