| OCR Text |
Show Plat and "Window Glut" Class Is made In two ways. Ons by blowing, th other by rolling. The blown glass, known as "window glass," Is not always uniform In section, may contain Imperfections, bubbles, sand marks, streaks, warped surfaces snd Is graded accordingly. Plate glass is free from the Imperfection Imper-fection of warpace, objects seen through It are not distorted. It Is more costly. Slns!e-strencth window glass may be used for smnll panes and storm sash. Mcht-welght plnte glass one-etghth-lnch thick Is recommended for small window. |