Up: Glassmaking
Flat Glass: 32 of 66
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when objects are seen through glass made in this way.
Other defects quite prevalent in
cylinder glass, which of necessity requires the flattening
process, are the "burns" or marks caused by the sheet of
glass coming in contact with an excessively hot or dirty
flattening stone. In addition to the foregoing and as a
further result of attempting to make the outside and inside
circumference of the cylinder equal in the flattened sheet,
the sheets are always noticeably bowed or bent.
On this account the sheets of glass
always have to be laid in the same way in the packing boxes
in order to minimize the inevitable breakage in shipment.
Furthermore, in subsequent glazing, the glass made by this
method, either by hand or by the more advanced cylinder
machine process, must be placed in the sash with the bowed
side out.
The hand cylinder process of making
sheet glass has been the accepted method for many
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