For Type No. 2 the loads to be considered are as follows:

Case No. 1. Dead-load stresses when the span is swung.

Case No. 2. Dead-load stresses for each arm acting independently of the other.

Case No. 3. Live-load stresses for each arm acting independently of the other.

The stresses in Cases No. 2 and No. 3 are to be combined, but those in Case No. 1 are not to be combined with either of the others, the effect of reversion of stress, however, being provided for as specified for fixed spans.

The only effect of wind load to be considered for the girders of Type No. 2 is that upon the connecting links over the turntable when the span is being rotated, for which case the amount of the wind load is to be taken at two hundred (200) pounds per lineal foot of span.

In general, the specifications for the detailing of fixed plate-girder spans are to govern the designing of plate-girder drawspans, except as hereinafter stated.

In deck, plate-girder draw-spans the girders are to be spaced the same distance apart as specified for fixed plate-girder spans of one half the length. For half-through, plate-girder, draw-spans the girders may be spaced as closely as the previously specified clearance requirements will permit.

For deck-spans four points of support on the drum will suffice, but for half-through spans eight points will be required. The diameter of the drum is to be made as small as practicable, but never less than eight (8) feet; and the distribution of the load over the drum is to be uniform.

All girders are to be thoroughly stiffened at all points of bearing over the drum, and bearing-plates not less than one (1) inch in thickness are to be used between the drum and all girders bearing on same.

For spans of Type 1, when the length over all exceeds ninety (90) or at the utmost one hundred (100) feet, it will be necessary to splice the main girders in the field. These splices must be thoroughly made, shingle or staggered splices only being allowed;  and  there  must  be  a twenty-five (25)  per cent