Abstract: A method of separating a selected ionic component from a sample, comprises contacting the sample with an ionic adsorbent whose charge density is such that the component is bound selectively in the absence of added ionic component that competitively binds the adsorbent.

Abstract: An ignition coil, spark plug, and pressure sensor for an internal combustion engine are, in a preferred embodiment, integrated into a single assembly and mounted directly on a plug hole of an internal combustion engine. A hard spark plug shell serves as a pressure member and on which a strain gage is affixed. Changes in the pressure in the combustion chamber deform the shell, causing a corresponding change in the resistance of the strain gage. A bridge circuit or the like is used to measure the resistance change thereby providing a direct indication of cylinder pressure.

Abstract: A cartridge comprises a longitudinal tube having a transverse open end. A projectile is accommodated in and can slide longitudinally inside the tube. The projectile is ejected from the tube through the open end by sliding longitudinally relative to the tube. There is a pyrotechnic charge in the projectile. A device for securing delayed initiation of this charge comprises a fuse, a percussion member in the projectile movable between a retracted position in which it is removed from the fuse and a striking position in which it strikes the fuse, a device adapted to hold the percussion member temporarily in its retracted position and complementary mechanical devices on part of the projectile and part of the tube facing the path followed by this part of the projectile as it is ejected.