Morris L. Nielsen

Fire-Resistant Treatment of Cotton Using Phosphorylamide

Phosphorylamide, a water-soluble phosphorus-nitrogen compound, was cured on cotton cloth to impart washfast fire resistance. Some loss in strength, particularly tear strength. resulted, part of which could be alleviated by use of a softener. Apparently a consid erable part of the nitrogen is present as imido (—NH—) nitrogen.

A Laboratory Arc‐Melting Furnace

Using a glass resin kettle as enclosure, and an inverted‐J electrode, a small arc‐melting furnace was designed for conveniently melting metals under an inert atmosphere.

Chemical microscopy of inorganic phosphorus-nitrogen compounds. Identification by their o-tolidine, ammonium, or silver salts

Abstract Procedures for obtaining crystalline o -tolidine, ammonium, or silver salts of four phosphorus-nitrogen compounds are described. These compounds are phosphoramidates, phosphorodiamidates, trimetaphosphimates, and tetrametaphosphimates. Photomicrographs of the crystals are shown.