… with an optical viewfinder or a liquid crystal display (LCD), or both. Many cameras equipped with an LCD can employ the display both as a viewfinder when …
… of bog iron ore or of hydrated iron(III)oxide, sawdust and calcium sulphate. This mass removes from the gas certain … gypsum in plasterboard manufacture. However, purified calcium sulphate isolated from these residues, is excluded ( …
… oxide (alumina). For this purpose the ground ore is calcined and then treated with sodium hydroxide to produce a … is then precipitated as aluminium hydroxide, which is calcined to give pure aluminium oxide in the form of a white …
