Cross-linked polyamides are produced by the noncatalytic polymerization of a lactam and a bis-lactam. The polyamides have known utilities.

An acid resisting alloy consisting essentially of about 10 to 50 percent titanium, 50 to 85 percent columbium, 5 to 10 percent tungsten, and 0.5 to 3 percent zirconium.

A novel composition of matter, ammonium polythiomolybdate, having the empirical formula 3MoS.sub.4.2NH.sub.4 OH.

A circuit for indicating the occurrence of a short circuit between an electrode and a workpiece including an oscillator; a transformer having tertiary windings, the primary winding being connected across the oscillator output, a first secondary winding connected across the electrode and workpiece, a second secondary winding connected to a signal level detector; and a lamp which is caused to light where the signal level across the second secondary winding drops below a predetermined level represe...

Compounds of the structure ##SPC1## Wherein R, R' , R.sub.1 and R.sub.1 ' are C.sub.1 to C.sub.20 hydrocarbon radicals. These compounds are useful as initiators or activators in the anionic polymerization of lactam monomers.

Compounds of the structure wherein Ar is a mono- or polynuclear aromatic radical, and R and R' are C.sub.1 to C.sub.20 hydrocarbon radicals. These compounds are useful as initiators or activators in the anionic polymerization of lactam monomers. BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to novel monoamide derivatives of N-substituted monoamino diaryl sulfones. 2. Description of the Prior Art Certain diamino diphenyl sulfone derivatives, including certain diamide...

Compounds of the structure ##SPC1## Wherein Ar and Ar' are mono- or polynuclear aromatic radicals, and R and R' are C.sub.1 to C.sub.20 hydrocarbon radicals These compounds are useful as initiators or activators in the anionic polymerization of lactam monomers.

Imminent failure of a lamp pump for a laser is anticipated by detecting a change in a physical dimension of the lamp normally occuring just prior to a failure. This change in physical dimension can be utilized to automatically terminate operation of the lamp.

The combination of a container for a liquid or a particulate solid, having a handle and a pouring spout, and a funnel which is adapted to be removably secured to the spout when pouring from the container and to be fitted over and become part of the handle when not in use.

Method of oxy-fuel cutting of thin plate the improvement of which comprises surrounding the cutting flame with an admixture of air and water.