ven to it by Lavoisier.
Black and Cavendish, in 1766, showed that carbonic acid (fixed air) and hydrogen gas (combustible air) are specifically distinct aeriform fluids.
Gas was distilled from wood in Paris in 1802; from oil by Dr. Henry, in 1805; from refuse, oily, and fatty matter by Taylor, and patented in 1815.
The operations of the Chinese being unknown to the outside barbarians, the streams of inflammable gas were for many centuries only objects of wonder and conjecture in the varwheel, then replaced the mass in the furnace, so that the vitreous matter might expand and fill up the spaces.
He thus combined good pieces of glass, so as to build up lenses of flintglass of fine quality.
Guinand joined Frauenhofer in Munich in 1805, and returned to his native canton in 1814, where he died, and was succeeded in his business by his sons.
Brunfaut of Vienna works a process in which he makes curled or frizzled yarn of glass.
The composition is a secret.