INDEX.

The pages refer to the sidenotes in the margin of the text.

Footnotes:

[1] The new columbiad is made without a chamber.

[2] A couple of notches or indentations are made on the ends of the eccentric axles. When these notches are in a vertical line, the wheels rest on the rails; but when they are in a horizontal or inclined line, the ties rest on them.

[3] The 2d method was suggested to me by Captain Vogdes, 1st Artillery, U. S. Army.

[4] [See Table, pages 126, 127].

Transcriber’s Notes:


Antiquated spellings and words were not corrected.

The illustrations have been moved so that they do not break up paragraphs and so that they are next to the text they illustrate.

Typographical and punctuation errors have been silently corrected.