The following was the cost of erecting a full column form including lining, plumbing, bracing and yoking, but excluding lumber and original construction:
| 1 carpenter, 3 hrs., at $0.25 | $0.750 |
| 1 helper, 3 hrs., at $0.175 | 0.525 |
| 1 helper, 1 hr., at $0.175 | 0.175 |
| 1-5 boss carpenter, 3 hrs., at $0.30 | 0.180 |
| ——— | |
| Total | $1.630 |
This gives a cost of $7.25 per M. ft. B. M. for erecting column forms.
The cost of erecting a full size girder form including lining, plumbing, bracing and setting six bolts was as follows:
| 2 carpenters, 5 hrs., at $0.25 | $2.50 |
| 2 helpers, 5 hrs., at $0.175 | 1.75 |
| 2 laborers, ½ hr., at $0.15 | 0.15 |
| ¼ boss carpenter, at $0.30 | 0.375 |
| ——— | |
| Total | $4.775 |
This gives a cost of $4.35 per M. ft. B. M. for erecting girder forms.
The reinforcement was erected inside the forms for both columns and girders. The cost of erection for one column was:
| 2 laborers, 4 hrs., at $0.15 | $1.20 |
| ⅓ foreman, 4 hrs., at $0.225 | 0.30 |
| —— | |
| Total | $1.50 |
This gives a cost of about 0.22 cts. per pound for erecting column reinforcement, including the bending of the horizontal ties or hoops. The girder reinforcement was erected by piece work at a cost of $1.80 per girder—or about 0.08 ct. per pound.
The concrete used was a 1-6 mixture of Portland cement and crusher run stone all passing a ½-in. sieve and 10 per cent. passing a 200 mesh sieve. No trouble was had in handling this fine aggregate. It was mixed in a Ransome mixer, elevated so as to deliver the batches into cars on a standard gage track. This track ran between the base slabs on which the molding was done. Each car held about 3 cu. yds. and discharged through a side gate and spout directly into the forms, the mixture being made so wet that it would flow readily. The company used its own cement and stone for concrete and charged up the cement at $1 per barrel and the stone at 60 cts. per cubic yard. At these prices, and assuming that a cubic yard of concrete of the mixture above described would contain about 1.25 bbl. of cement and 1.5 cu. yd. of stone, we have the following cost of materials per cubic yard of concrete: