The bars were of the nominal dimensions of 2" x 1", planed all over, the load being applied at the centre of the specimen, and the greater dimension of the bar being vertical. Distance between supports = 36 inches.

The chemical analyses of the bars referred to in the foregoing table are as follows : -

Bars Nos. I. And II

Ultimate tensile strength = 31.2 tons per square inch. Ultimate elongation = 10.0 per cent.. in 8 inches. Angle bent through (1 inch square) = 90°.

Bars Nos. III. And IV

Ultimate tensile strength = 28.86 tons per square inch. Ultimate elongation = 22.5 per cent. in 2 inches. Contraction of area = 22.0 per cent.

Bar No. V

Ultimate tensile strength = 35.6 tons per square inch. Ultimate elongation = 15.6 per cent, in 2 inches. Angle bent through (1 inch square) = 85°.

The chemical analyses of two specimens of cast-steel bars not submitted to a transverse test are as follows: -

Ultimate tensile strength (a) = 28.9, (6) = 28.2 tons per square inch.

Ultimate elongation (a) = 21 per cent, in 8 inches, (b) = 35 per cent, in 2 inches.

Angle bent through (1 inch square) (a) = 90°, (b) = 180°.

Chemical Analysis Of Cast-Steel Brackets For Sliding Doors

The ultimate tensile strength of this metal was 36'0 tons per square inch, and the ultimate elongation was 15.7 per cent, in 8 inches. (Test No. 268, Table No. 20.)

The series of tests which follows on the transverse strength of cast-iron bars is but a selection from a number of tests made in different foundries, and covering a wide range of constructive practice. The material represented was used for bridge and jetty cylinders, bollards, machinery castings, various details in connection with bridge construction, penstock frames and doors, and the like.

The variations shown are characteristic, but the general average indicates that the standard of strength and elasticity aimed at in the specification has been generally attained, and fairly represents good modern foundry practice in this class of work.