Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 501
ven, divide this productby the breadth in inches, andextract the square root of thequotient, which is the depth. Itis expedient, however, to makemain beams strwiger than is in-dicated by any of these rules, as a higher pressure of steam is now used almost tmiversally than was employed by Mr. Watt.… … ^-I^ts^^li- J^ tf.
Mechanical engineering
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