Engraving on glass by electricity

✍ Scribed by C.

• Book ID: 103085570
• Publisher: Elsevier Science
• Year: 1878
• Tongue: English
• Weight: 109 KB
• Volume: 105
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(78)90282-x

✦ Synopsis

damage cost 44,000 marks, and the indirect loss to trade and commerce was incalculable. In times of a political crisis, or at the outbreak of a war, such widespread interruption to customary intercourse might be attended with the most serious consequences.

C.

Artificial Feldspars.--M. Hautefeuille produces tridymite, orthoclase and triclinic feldspars, by exposing a mixture of silex and alumina, in presence of acid tungstate of potash, to a temperature between 900 ° and 1000 ° . If the potassa and alumina have been properly proportioned, the tridymite and triclinic fehlspars soon disappear, and their elements increase the crystals of orthoelase.

After fifteen to twenty (lays' heating, these crystals remain alone, and they may he easily separated, since the tungstate is soluble in boiling water. If soda is substituted for potash, the crystals are of albite. The committee to which M. Hautefeuille's paper was submitted (MM. tI.