Page 79: pièce de resistance changed to pièce de résistance.
Page 91, illustration caption: English Locomtlvoes changed to English Locomotives.
Page 175: ... told me had had supplied all the money ... changed to ... told me he had supplied all the money ....
Page 287: ... this they had been keen kept in ignorance of ... changed to ... this they had been kept in ignorance of ....
Page 294: b′ and c′ in the text changed to b¹ and c¹ as in the illustration.
Page 303: ... to very the speed ... changed to ... to vary the speed ....
Page 331: ... before I left planning a smaller engine ... changed to ... before I left, planning a smaller engine ....
Page 333: closing quote mark inserted after ... employing six typewriters.