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The Manufacture Of Plate Glass

The Manufacture Of Plate Glass image
Parent Issue
Day
9
Month
June
Year
1881
Copyright
Public Domain
OCR Text

The pouring of liquid glasa froin the Oirnace npon the cast iron plates, and the subsequent rolling, are processes comparatively simple. Any housekeeper who has used a rolling-pin on a bateli of pie-crust dough, perfonns an operation very similar to tliis stage of plate-glass inaking. It is the succeeding processes of grinding and polishing and (nal burnishing that require time and costly mechanism. Af ter leaving the rolla and bed plate the glass is rip" pled and rougli, ainl only fit lor gratings or skylights. Kach pUte must be transferral to machines that resemble the turn-tables of a railway. On the revolving platform tlie glass is cemented into a bed of piaster of Paria, and the machine started. Hearing heavily on the surlace of the glass are blocks of metal, and while in motion the surfaces are kept supplied with sharp sand and a constant stream of water. The next stage of the glassgrinding process is the same as to Kiachinery, but instead of sand eoar.se emery is used. Then liner emery is used in anotlier revolving table, and so on lor half a dozen times. The linal polishing is done by heavy reciprocating devices, fetl with rouge, and maintaining a constant back and forward motion, and also a lateral uiovement over the surf ace of the crystal. All this reiuires the assistance of a lartrfi forcé of men, many of tliein skilied laboréis. After going through these different grindings and polishings the plate that measured an inch in thickness is only three-quarters of in incli thick, has lost all its rouglmess, and is ready for the show-window of the purcliaser. - l'ittxbunj Teliyraph. A BUbscrïbér asks if we can recommend a cheaj) and popular watering place. Certainly; the town pump. -

Article

Subjects
Old News
Ann Arbor Democrat