A bottle mould rises and envelops the mass of molten glass.
Glass is blown into an oblong box-shaped iron mould, about 12 in.
It is by this time mere vegetable mould and undistinguishable pond shore, through which rushes and flags have pushed up.
The mass of glass, yielding, to its own weight and the pressure of air or steam, sinks downwards and adapts itself to any mould or receptacle beneath it.
During the greater part of the 19th century the ideal of ploughing was to preserve the furrow-slice unbroken, and this object was attained by the use of long mould-boards which turned the slices gently and gradually, laying them over against one another at an angle of 45°, thus providing drainage at the bottom of the furrow, and exposing the greatest possible surface to the influences of the weather.