Page [2].
“thought than an English translation” is changed
to “thought that an English translation”.
Page [38.]
In the sentence “If the desired blackening is not effected
with one application the operation must be completed”, it seems likely
that “completed” should be “repeated”.
Page [39.]
“Gum arabic 17.5” to “Gum arabic 17·5”.
Page [69.]
“great intensity on the sensitive will” to “great intensity
on the sensitive plate will”.
Page [73.]
“½ to 1 mm.
(= 1/12–1/25th inch)”
to “½ to 1 mm.
(= 1/50–1/25th inch)”,
though other interpretations
are possible. For example, the similar instance on page
[85] “50–80
cm. (= 24 to 36 ins.)” is also wrong (or, more charitably,
inaccurate), but is retained as printed.