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centres. These floor-beams are supported through the centre by a wrought-iron 15-in. rolled I-beam,200 lbs. per yard, resting on four columns, each column consisting of a wrought-iron 9-in. rolledI-beam, 100 lbs. per yard. The floor-beams are supported at their ends by wrought-iron 12-in. rolledbeams, 170 lbs. per yard, connecting on six sides the corners of an octagon formed by eight cast-ironornamental columns, which transmit the load to the stone foundation. These cast-iron columns are10 ft. high, nf in. outside diameter at the top of the shaft and 14^ in. at the bottom, and have a
Fig. 266.—Ground-plan.
base 20 in. square. The thickness of the metal in the columns is if in. The foundation-wall is. 28in. wide on top, with appropriate openings for the passage of pipes underneath the ground, whichpipes ascend to the tank in a frost-proof pipe-chamber, for which a special foundation-wall is built,as shown on the plans. The floor of the tank is usually set about 15 ft. above the top of rail.
In general it can be said relative to the water-tanks on the Lehigh Valley Railroad that they areusually connected with stand-pipes located between the main tracks, or alongside of leaders, or atthe head of yards, in which case attachments for the delivery of water directly out of the tankthrough goose-necks, etc., are not required. The supply-pipe and waste-pipe are 4 in. in diameter,and the delivery-pipe is 8 in. in diameter.
The following estimates of the cost of the standard 20-ft. and 30-ft. tanks on wrought-iron orcast-iron columns and on stone foundations have been kindly furnished by Mr. Pascoe, who statesthat the figures represent fair averages for usual conditions encountered :
Cost of a 20-ft. tank complete on wrought-iron columns.
Wrought-iron (15,775 lbs.). 500 00
Tub. 302 00
Pipes, valves, and laying. 443 90
Erection. 115 00
Total. $1,696 90
Cost of a 30-ft. tank complete on wrought-iron columns.
Wrought-iron (28,936 lbs.). 927 00
Tub. 461 00
Pipes, valves, and laying. 486 30
Erection. 189 00
Total. .. .. $2,465 30