Thioxanthenones are used as photoinitiators, in admixture with other initiators, e.g., polynuclear quinones, lophine dimers, etc., in photopolymerizable systems.

In compositions of noble metal(s) dispersed in an inert vehicle which are useful for forming electrodes on dielectric substrates, improved electrode compositions comprising an amount of NiO effective to increase fired conductor adhesion to substrates; since the resultant fired electrodes have increased adhesion to ceramic dielectric substrates, they have special utility in forming surface metallizations in electronic circuits.

A dry compacted Caseless Propellant Charge comprising in addition to the usual constituents of a propellant explosive, a proportion of nitrocellulose having an average nitrogen content of 11.0 to 12.0 percent by weight.

The photoelectric conductor device comprises a first layer of cadmium selenide or cadmium sulfoselenide, a second layer formed on the first layer and made of a substance containing cadmium salt of oxy-acid, and a third layer formed on the second layer, the third layer being made of a high resistance substance having a resistivity of more than 10.sup.8 ohm-cm and being selected from the group of compounds not including cadmium selenide.

Vinylcyclopropanecarboxylates having an excellent insecticidal activity and a property harmless to mammals and cattle, of the formula, ##SPC1## Wherein R is 2-propargyl-3-methyl-2-cyclopentene-1-one- ##SPC2## Wherein R.sub.1 is allyl, propargyl, benzyl, thenyl, furylmethyl or phenoxy, R.sub.2 is hydrogen, or R.sub.1 and R.sub.2 are bonded at respective ends to form a polymethylene group having 3 to 4 carbon atoms, and X is oxygen or sulfur.

Micrometer comprises a spindle which is axially advanced by rotating a knob or ring and a digital indicating counter actuated in response to movement of said spindle and seated in the guide for said spindle. The micrometer comprises means for adjusting the counter and means for taking up any play between the spindle and spindle guide.

The invention relates to an electromechanical transducer comprising an electret one side of which faces a control surface of a semiconductor element and the other side of which faces a a movable control electrode to the semiconductor element. The control surface of the semiconductor element is, according to a first plane geometrical pattern, divided into a surface part responsive to an external field and into another surface part not responsive to an external field while the surface of the movab...

Compact inside micrometer comprising counter directly or indirectly connected to a guide which operates scale-carrying rings in the counter through a connecting bush interlocked with a spindle. The counter may be adjusted by separating the connecting bush from the guide.

Potentiometer including a transport screw for the linear displacement of an insulating contact member, and a hairpinlike contact spring which engages the screw, the contact member and a resistance track respectively.

In one embodiment, an input signal is applied to an LSA oscillator circuit where it mixes with the oscillatory frequency f.sub.LSA to give a difference frequency f.sub.a that is amplified. In another embodiment, a signal of frequency f.sub.a applied to an LSA oscillator modulates the oscillatory output frequency. In another embodiment, an input frequency f.sub.a mixes with the oscillator frequency to give an amplified sum frequency. In all the above embodiments, f.sub.a conforms to the relations...