Footnote [24]: “The German word Kette”—had “work.”
Questionable spellings have been retained as follows:
Page [125] and [Index]: J. B. [Johann Bartholomacus] Tromsdorff—should be Johann Bartholomäus Trommsdorff?
Page [129]: “sulphur, phosphorous and carbon”—should be “phosphorus” but may be misspelled in the quoted material?
Footnote [20]: “Sur le Multiplier electro-magnetique”—should be “Multiplicateur”?