A treatise on the progressive improvement, and present state of the manufacture of porcelain and glass by Porter George Richardson 1792-1852

Author:Porter, George Richardson, 1792-1852
Language: eng
Format: epub
Tags: Porcelain, Glass manufacture
Publisher: London, Printed for Longman, Reese, Orme, Brown, and Green [etc.]
Published: 1832-03-25T05:00:00+00:00

through the tube, otherwise the external air being more dense than me heated portion confined within, the globe would collapse : when it 1ms been somewhat stiffened by cooling, this accident is no longer to be apprehended.

The gkbe, which b not nHule aufficientlf thm bf this am blowing, ia then heated anew bjr being held a little withm the

■ opening of the furnace; the breath is again empli^ed aa before, and eo on repeatedly, until the' ptopei size and thickneas of the globe are satiB&clorUy attained.

IT the Sam of the intended vessel requires lbs ^obe to be elongated, this efiect is produced by giving to the tod, while ' the gloss attached to it is softened by heat, an alternating motion similar to that of a pendulum, or b; dexterously making il perform a circle swiftly throuBh the air. The tendency to fly off from the centre which is uus imparted cauees the paiticlea to change their relative positions in a degree corresponduig with the amount and duration of the force employed.

At this stage another implement, called a puni, or jiontii, is brought into use. This is a solid inm rod of a cylindrical fiirm,

amaller and lighter than tlie tube used for blowing, ahd consequently more within the power and management of the workman. Opon one end of this rod a femall portion of melted glass is cdlected, by an assistant, from the crucible, and in this stale ifl a[^Iied Co the surtkce of (be globe on the side opposite to that where it is already attached to the tube. '-The two heated substances speedily uniting, the glass is detached &om the hollow

FHsr.e.

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