On the ep of Glass. 121 
d gra 
ignition, through the flue 6, while the rear, communicating 
with this oven, receives heat from it, but in consequence of 
the arch covering it being much lower than that thrown over 
the oven, the heat as you proceed from the oven gradually 
diminishes so that at its entrance, the temperature ts less 
ing, that the heat should be cautiously applied. This is ef- 
fectually accomplished, by constructing the rear as above 
described. Within the rear on its bottom are placed two 
ban of iron extending its whole length, which is usually 
about ten feet. When the ovens have been brought to the 
desired temperature, an iron plate is put over the flue at a, 
closing it entirely ; some splinters of wood, are then thrown 
into the oven, to sustain its heat and give light to the work- 
men. A boy is now employed, to bring the cylinders and 
ut them in upon the iron bars, in the rear, propelling them 
nuccesively forward by means of a rod, until the rear is full. 
anding at the opening D, by means of an iron rod, 
now Sines the cylinder which was first put in, upon the 
stone E; here the temperature is such, that a bp being 
oe is spread outupon the stone. A blo 
ached to ae other iron rod, is then passed over € Laer 
me glass into close contact with the stone. The workman 
now, with i iron, called the cropper, shoves it tidér the 
partition, upon another stone, F. It is allowed to remain 
upon he bag until it is sufficiently cool to retain its form. 
A man at G, then removes it to the back part of the oven, 
were! his places it upon its edge in nearly a vertical position 
—thus each successive cylinder is made to pass through these 
several steps of the process, and they are eventually packed 
away together in the annealing oven. When the ovenhasbeen 
filled, the fires are put out and every passage into the ovens 
is closed with mortar. It is allo ia to remain in this situa- 
tion, a week in winter, and ten days in summer; at this time 
isoven % is nee and the glass being sufficiently ¢ al to be 
handled w othe 
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Vor. XVL —No.1 16 
