… of silicate ores) electrolysis. (I) Thermal reduction is effected by heating the oxide or silicate with coke in closed retorts. The temperature is sufficient to vaporise the zinc which distils over into …
… heads, tails, maws (swim bladders) and other edible fish offal ( Chapter 3 ). (b) Shells of molluscs, … (12) Dead animals of Chapter 1 or 3 and their meat or meat offals unfit for human consumption other than products of …
… board the ship). Another type is based on the principle of differential pressure , the pressure varying according to … with altitude. (2) Air speed indicators . These operate by differential pressure measurements of the aircraft’s … speed of descent or ascent of the aircraft, by means of a differential pressure gauge. (4) Artificial horizons or …
… or not domestic. The heading also covers machines of different types designed for cleaning or drying bottles or … (6) Machines for aerating beverages. These are, in effect, bottle filling and closing machines with provision …
… This heading covers only those valves and tubes which, for different purposes, utilise the effect of electrons emitted from a cathode either in a … etc. The same envelope may contain two or more systems with different functions (compound valves). The envelopes are of …
