Objections to “hard glass”

• Publisher: Elsevier Science
• Year: 1878
• Tongue: English
• Weight: 57 KB
• Volume: 106
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(78)90490-8

✦ Synopsis

Earth Currents. 65 Earth Currents.--Du Moncel objects to the term "telluric currents," because the currents during the day are inverse to those which are produced during the night. During the day they are directed from the telegraph line to the earth and are thermo-electric. During the night they have an opposite direction, because the dew cools the wire and produces an increased oxidation which makes the currents hydro-electric in their character.--Comptes tgendus. C. Objections to "Hard Glass."--A. Lamek (Polyt. Notizblatt)

warns chemists against the use of beakers, alembics, and other articles made of "hard glass." He was filtering a solution of phosphate of lime into a half-litre glass, when it suddenly exploded, without any perceptible cause. He had not heated the glass, neither was there any shock or change of temperature, but the glass was "shivered into a million fragments," and he was wounded in the back.

C.