A compression-vacuum percussive action machine has a housing (1) which accommodates a cylinder (2) containing a hammer (7) and a piston (3) separated from the hammer (7) by an air cushion (8), a crank (5) connected to the piston and linked with a drive shaft (6) by a counterweight (10) whose center of mass is offset relative to a straight line (A--A) connecting the points of intersection of the axes (O.sub.1 and O.sub.2) of the drive shaft (6) and crank (5) with a plane perpendicular to the axis...

A compression-vacuum action percussive machine is proposed, which has a casing (1) accommodating a tool (7) and a cylinder (2) with a drive piston (3) and a striker (4) having a chamfer (10) on the end face engageable with the tool (7), and also a means for trapping the striker (4), which means is made in the form of a sleeve (11) with an annular groove (13), wherein a resilient ring (14) is mounted. The sleeve (11) has an inner annular rib (15), the diameter of which is smaller than the diamete...

Phosphate neodymium glass for laser use, consisting of phosphoric anhydride, an oxide of at least one of alkaline metals, and neodymium oxide or a mixture of neodymium oxide and oxide of at least one of the following metals; La, Gd, Lu, Sc, Y, Al, Cr; the ratio between the above-cited components as follows (mol. %): The herein-proposed invention is intended for producing active elements for lasers of a wide purpose including thin-film and miniature lasers with generation wavelengths within the r...