OCR Text |
Show Uncrackable Glass. Glass that can be heated white hot and then plunged Into cold water without breaking, while an aparent impossibility, im-possibility, has yet been made an accomplished ac-complished fact This glass is derived from Brazilian Brazil-ian quartz pebbles heated red hot and then thrown Into distilled water. The purest pieces are selected and welded with the oxyhydrogen blowpipe into-long into-long stems like straws, from which glass vessels of any shape can be manufactured. man-ufactured. Thus far this quartz glass has been employed chiefly for making laboratory apparatus. A test tube made In this way will not break when a white-hot coal Is dropped Into It |