pn

With unit load in the position shown, the load at D′ is (p-n)/p, and that at E′ is n/p.

The loads at D′, E, due to unit weight on the rail girder are (p-n)/p and n/p.

Azophor red P N is also a preparation of diazotised paranitroaniline in the form of a dry powder which keeps well.

The developing bath for the brown is the same as for the paranitroaniline red, or the Azophor red P N bath may be used.

Pass this through the slits (p n in Fig. 425) in the short sides of the box.