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calledTHE ANNEALING PROCESS, without which glass would be worth nothing . The plates are allowed to remain in these ovens from\hree to six days. After one oven is full the door is plastered up, and a work«hole just above the door is also made tight. These apertures are opened partially at first so as not to cool the glass too soon, and at the end of the proper time they are taken down altogether. When taken out of these ovens the plates are cut into whatever size may be desired, and are then taaen to another factory near by,whore they are polished. This process is done by means of polishing machines, which are a very important part of the c mpany's apparatus, and cost about four thousand dollars each. The glass plate is placed in the bed of one of these machines, and upon it is placed a composition of sand or emery, the wheels of the apparatus are then brought to bear upon the glas? by means of a lateral rotary motion. There are three or four smaller wheels situated within a larger wheel, this wheel revolves, moving the smaller wheels, they having a separate motion of their own. This bed is so nicely adjusted that it can be raised or lowered to any height in order that the plate of glass may be placed at any distance from the polishing wheels that may be desii^i. Afier the polifchiBg process is completed the plates are taken out, wiped off, and are ready for the market.OTHER MANUFACTURES.This Company, besides making their plate glass, have, as we mentioned, one faotory devote i to the manufacture of common window glass* another to bottle and a third to kriolite. This latter substance is a mineral which is imported from Greenland, and is composed chiefly of sodium, aluminum and florine. It is manufactured in the same manner as glass into bottles, lamp-stands, etc., and is also made into larg3 plates and polished similar to the plate glass. It resembles marble in appearance, being white and clear, and can be used for ail purposes for which marble is used. In on* respect it is much better, as having no limestone in its composition it does not possess the property of absorption thereby, easily receiving aud showing spots and stains. Photographs taken on
Newspaper Details
Boston Post
Boston, Massachusetts, US
Mon, Jan 22, 1872
Page 3
Full Page
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Lenox L.
MA, USA 20 Oct 2023
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