Illustration: FIG. 5. (‡ ELONGATED BLOW GLASS.)

Sheet-glass is commenced in the same way as crown, but instead of a

hole being made the blowing is continued till a great round ball is

formed, the rod and this ball are then swung round at arm’s length--a

hole being sunk in the ground for the purpose--which causes the globe

to become elongated, as in fig. 5. It is then laid upon an iron

table, and rapidly slit up, the compressed air escaping from within

opening it out into a broad sheet, which is instantly cut square

while yet soft.

Illustration: PLATE GLASS CASTING. BRINGING OUT THE POT.