The equation given for first-class stores, in Transverse Strains,

Art. 702, is -

d3=(263+yd)l3/.768 F

which may be changed to this form:

(65.)

(65.)

in which y is as before, and k for -

Georgia Pine equals..........................

0.4

Spruce equals.....................................

0.472

White Pine equals...............................

0.502

Hemlock equals...................................

0.506

This rule may be put in words the same as Rule XLVII., except as to the constants, which require that 263 be used in place of 82, that k be used in place of h, and that 0.768 be used in place of 0.576. Table XXI. of Transverse Strains contains the results of computation showing the depths of solid timber floors for dwellings and assembly-rooms and for first-class stores, in floors of spans varying from 8 to 30 feet, and for the four kinds of timber before named.

Iron Floor-Beams