… types of sheet piling. (4) Sheet piling conduits and columns which are driven into the ground in such a manner … sheet piling conduits are corrugated in shape. Sheet piling columns are made up of two sections welded together. Sheet …
… Prepared by the action of a slightly nitric solution of potassium permanganate on a manganous salt (e.g., the … colours (brown pigments known as mineral bistre, manganese bitumen ), certain mastics, and synthetic semi‑precious …
… It may also be obtained by the action of mineral acid on sodium thiosulphate, or by cathodic pulverisation. Colloidal … be preserved in this state only if a protective colloid (albumin or gelatin) is added, and even then it can be kept …
… aromatic hydrocarbon mixtures of which 65 % or more by volume (including losses) distils at 250 °C by the … tar, by the “stripping” of coal gas, by the processing of petroleum or by any other process. The heading includes the …
… is revolved in contact with a “flint” (generally of ferro‑cerium alloy). (2) Electrical lighters . Current … lighters . In these a catalyst (usually sponge platinum) is made to glow by catalytic action in the …
… etc. Some rail‑cars are fitted with solid or pneumatic tyres and others are of the rack‑rail type. (C) … vehicles . The principle of this system is based on the accumulation of kinetic energy in a fast revolving flywheel. …
