ss, 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.
One workman with a wheel having a diameter of 5 Austrian yards will spin 3,500 yards per minute.
It is used for many descriptions of fabric and fosthorn (Austrian) alloys are known as sterro-metal.
One variety is soft, ductile, and capable of being worked into sheets or wire.
The other is hard, and is represented as suitable for ordnance.
From experiments made at the Imperial arsenal at Vienna, its tensile strength was, after single fusion, 28 tons to the square inch; after forging at a red heat, 32 tons; drawn cold and reduced from 100 to 77 sectional area, 37 tons.
The metal thus tested contained a rather less proportion of tin and