and compressive tests (Fig. 1, Plate XIII). The 600,000-lb. machine is
capable of testing columns up to 30-ft. lengths, and of making
transverse tests of beams up to 25-ft. span, and tension tests for
specimens up to 24 ft. in length. The smaller machines are capable of
making tension and compressive tests up to 4 ft. in length and
transverse beam tests up to 12 ft. span. In addition, there are ample
subsidiary apparatus, including concrete mixers with capacities of ½ and
1 cu. yd., five hollow concrete block machines, automatic sifting
machines, briquette moulds, storage tanks, etc.

At the Atlantic City sub-station, there is also a 200,000-lb.,
universal, four-screw testing machine, with miscellaneous equipment for
testing cement and moulding concrete, etc.; and at the Northampton
sub-station, there is a complete equipment of apparatus for cement
testing, capable of handling 10,000 bbl. per day.

At the Pittsburg testing station, a 10,000,000-lb., vertical,
compression testing machine (Plate XIV), made by Tinius Olsen and
Company, is being erected for making a complete series of comparative
tests of various building stones of 2, 4, and 12-in. cube, of stone
prisms, 12 in. base and 24 in. high, of concrete and reinforced concrete
columns up to 65 ft. in height, and of brick piers and structural-steel
columns up to the the limits of the capacity and height of the machine.

[Illustration: PLATE XIII.

Fig. 1.--Testing Beam in 200,000-Lb. Machine.

Fig. 2.--Fire Test of Panel.]