… form of rods, or of carbon, silicon carbide, metal or metal oxide film. They may be obtained in the form of individual … measuring purposes (e.g., in laboratories); also resistance boxes consisting of a number of such resistors assembled in …
… colours are dry mixtures formed by the heat treatment of oxides (of antimony, silver, arsenic, copper, chromium, … or pigments; sometimes substances (e.g., titanium or zinc oxides) are added which produce decorative crystalline …
… animal hair according to length. These consist of a long box divided across its width into compartments into which … a flat table also covered with card clothing. (13) Draw boxes, gill boxes, etc . These draw out the slivers to a smaller …
… articles thereof. Commercially, tin is extracted from the oxide ore cassiterite (or tin‑stone) classified in … or by crushing and flotation. (II) Treatment of the oxide by roasting, magnetic separation, or with acids or … lead, iron and tungsten. (III) Reduction of the purified oxide with coke to produce a crude tin. (IV) Refining of the …
… the raw flax is first boiled in a solution of sodium hydroxide and then impregnated with sodium carbonate; it is … the stalks are disintegrated by the liberation of carbon dioxide, leaving the flax fibres free. Flax so treated does … In their final stage rovings may be drawn out very fine to approximately the thickness of a single yarn, usually with a …
