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·Title ·21 ·48 ·75 ·102 ·129
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·iv ·23 ·50 ·77 ·104 §Plate 1
·v ·24 ·51 ·78 ·105 ·131
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§Contents ·26 ·53 §80 ·107 ·Plate 2
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·3 ·30 ·57 §84 ·111 ·Plate 3
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·7 ·34 ·61 ·88 ·115 ·Plate 4
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·11 ·38 ·65 ·92 ·119 ·Plate 6
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·14 ·41 ·68 ·95 ·122 §Index
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Glass-house furnace
Elevation of the furnaces, and interior view of the Glass-house
and working operations.


FURNACES.

A flint Glass furnace, in principle, is intermediate between an air furnace and an oven; too much draught would drive the caloric up the chimney or shaft, and too little would fail to yield sufficient oxygen to support the requisite heat. The draught must never be too strong to prevent a plus, or pressure of short and sharp flame outwards from the bye-holes of the furnace on each side of the pot mouths. Large caves,