Abstract: A miniature cell 0.1 inch diameter, and 0.75 long using lithium/sulphur dioxide electrolyte complex; and the method of preparing it. A hypodermic needle sealed at its outer end serves as an anode support and current collector and also provides a conduit for injecting a liquid electrolyte into the cell.

Abstract: A beam of spectral energy is directed onto a weld spot and the integrity of the weld is measured by the strength of the reflected beam or of the transmitted beam, which may also involve a function of the refractive characteristic effect of the weld spot on the incident beam.

Abstract: An electric cell with a lithium/sulphur-dioxide electrolyte complex, corrosive and potentially dangerous, and having automatic protective structural features responsive to excessive internal temperatures or pressures that would be due to internal fault conditions or to external short-circuit conditions, with those protective features serving to selectively vent the cell or to break the internal cell circuit, to prevent explosive rupture of the cell and consequent possible damage to personnel in the adjacent surrounding environment by the corrosive ingredients of the cell.