As the lumber was used three times, the cost per thousand for all work and materials on the forms would be just one-third of this—namely: $14.06.
Since the framing, erecting and tearing down cost $19.90 plus $4, or $23.90 per M. ft. B. M. purchased, and since the lumber was used three times, the labor cost nearly $8 per M. each time that the lumber was used. It will be noted that 8,400 ft. B. M. were required for the 83 cu. yds. of concrete, or a trifle more than 100 ft. B. M. per cubic yard.
It will be of interest to see the labor costs of forms for the various parts of the structure.
For the sides the cost of framing and erecting the forms was $4.19 per cubic yard. Of this cost 4 per cent. was for common labor and the rest for carpenters. The tearing down cost 47 cts. per cubic yard. For the columns the erecting was $2.35, of which 1 per cent. was for common labor. The tearing down cost 47 cts. For the girders and top the erecting cost $1.83, of which 35 per cent. was common labor. The tearing down cost 61 cts. per cubic yard. A summary would show:
| Sides per cu. yd. | Columns per cu. yd. | Girders and top per cu. yd. | |
| Framing and erecting | $4.19 | $2.35 | $1.83 |
| Tearing down | .47 | .47 | .61 |
| —— | —— | —— | |
| Total | $4.66 | $2.82 | $2.44 |
The greater cost of the columns forms over the girders and top was due to the fact that the columns forms were handled almost exclusively by the carpenters, and also in setting them great care and much time had to be used to get them plumb and in line. The cost of the forms for the sides was about twice as great as that for the top and girders. The reasons for this are evident. The walls had forms on both sides, while the top needed forming only underneath it, the area covered on the forms being about 2,200 sq. ft. as compared to 1,000 sq. ft. The side forms had to be set plumb and kept so. The framing was done ahead, but nearly half of the lumber in the sides was erected as the concrete was being put in place. The forms for the top were all put in place before any concreting was done on the top, and the carpenters discharged. A much larger per cent. of common labor could be used in placing forms for top and girders than on the sides. The props were nearly all put in place by laborers. The extra cost of tearing down the forms for the top was due to the fact that the lumber all had to be handled one piece at a time through a small manhole in the top, and carried about 150 ft. to be piled.
To all the costs for forming should be added 6 cts. per cubic yard for nails, wire and lines used on the forms.
Concrete.—The mixtures varied for the different members. The cost of materials was as follows:
| Cement, 110 bbls. @ $1.12 | $123.20 |
| ¾-in. stone, 80 cu. yds., @ $1.86 | 148.80 |
| Gravel, 3 cu. yds., @ $1.33 | 4.00 |
| Sand, 42 cu. yds., @ $1.20 | 50.40 |
The sides were first put in place, then the center columns were built, following which the bottom was placed. Then the forms were erected for the top and the girders, and these cast. In building the sides, one side and half of the two ends were built at one time, and then forms erected for the other half of the sides. For the sides the mixing was done in the bottom of the reservoir. For the rest of the structure it was done on the ground, the mixing board being along side of the reservoir. The labor cost of the concrete work for the various members and the average per cubic yard was as follows: