sion points shall be about one hundred and fifty (150) feet. If this length be exceeded materially, the columns may have to be strengthened to resist the bending caused by changes in temperature.

All expansion-pockets are to be so detailed as to throw the load from the longitudinal girder as close as possible to the web of the cross-girder; and sufficient rivets are to be used in connecting the pocket to the cross-girder to provide for both the direct shear and the bending moment from the eccentric load.

All anchor-bolts at column feet are to extend well up above the base-plate, passing inside of a curved plate that is riveted to the column, and which supports a heavy washer-plate to receive the anchor-bolt nut. The space between the curved plate and the anchor-bolt after erection is to be filled with Portland-cement grouting.

All column feet are to be raised so far above the ground that no dirt, snow, or moisture can collect around them and remain there. The boxed spaces at column feet are to be filled with Portland-cement concrete made with small broken stone.

The bases of pedestals are always to be made large enough to prevent all possibility of settlement of foundations. In figuring the pressure on the base of the pedestals it is not sufficient to recognize only the direct live and dead loads, but it is necessary also to compute the additional unequal intensities of loading caused by both longitudinal and transverse thrusts.