Page 199, "Poustchin" changed to "Poutschin" (Alongside Poutschin remained for some)
Page 208, "spaces" changed to "space" (intervening space of)
Page 212, subscript for O in chemical formula was unreadable. "5" was presumed and added. (the formula CH7(NO2)3O5)
Page 240, "Seimens" changed to "Siemens" (due to both Dr. Siemens)
Page 241, "Seimens" changed to "Siemens" (that the Siemens machine)
Page 271, this paragraph seems to be missing a word but was retained as printed as the word could not be presumed by research.
"Oxygen" is the most important element of an electrolyte, and to the affinity for oxygen of the metals is the magnitude of the result and effect.
Page 298, "Calland" changed to "Callaud" (Calland and Marié-Davy)
Page 302, "dislectric" changed to "dielectric" (Gutta-percha as a dielectric)
Page 11, advertising page, "Portsmouth." added to publisher line at bottom of page. Original ended with (Griffin & Co Publishers, 2, The Hard,)