General remarks:

• Where the small illustrations are not clear enough to see all details in the drawings, hyperlinks in the left margin link to larger scale images.
• Some page numbers are missing due to full-page illustrations having been moved around.
• There are some differences in wording between the Table of Contents, the lists of sections per chapter, and the actual section titles. Their meaning is clear, and they have been left as they were in the original work. The hyperlinks link to the proper sections or paragraphs.
• Some in-line multi-line formulas have been transcribed as single-line formulas, where necessary with brackets added.
• Page 56, table: Fig. 8 in the first column does not refer to Fig. 8 in this work.
• Page 186, Fig. 67: the dimensions in the lower right corner are partly illegible, they possibly read (4) ³/₈'' 16 Tap ¹/₂'' Deep U. S. St'd. Threads.
• The original work does not have a Figure 89.
• Page 283, Fig. 113: the dimension 4'' should probably refer to the cylinder diameter (if drawing is to scale), not to the cylinder diameter plus part of the large valve as in the drawing.
• Page 303, table: it is uncertain what free with kerosene means, there may be a word omitted.
• Page 544, entirely censored. It is not clear what this page originally contained (possibly a table), since text and numbering of illustrations are uninterrupted. The text CENSORED has been moved to after the first paragraph of the section on Mercedes Engines.
• The List of Illustrations does not occur in the original work.

Changes made:

• The text of the original work (including inconsistencies in accents, spelling, hyphenation and lay-out, and differences between the main text, illustrations and advertisements) has been followed, except when listed below. Only some minor obvious typographical errors have been corrected silently.
• Where the author used x for multiplication, this has been replaced by × in the body of the text (not in the advertisements or illustrations).
• The illustrations have been moved so as not to disrupt the flow of the text.
• Engine and aircraft types are not always named consistently in the original; Curtiss engine O X 2, OX-2, 0X2 and 0 X 2 have all been changed to OX-2, Curtiss aircraft JN4 and JN-4 to JN-4.
• Multi-page tables: repeated headings have been removed, and the tables treated as one consecutive table.
• Page 22: The product of has been moved into the first formula.
• Page 25: When B × r = M changed to When P × r = M.
• Page 74: .225 ÷ 775 = .2905 changed to .225 ÷ .775 = .2905.
• Page 137 (caption): Bavary changed to Baverey as elsewhere.
• Page 172: evidently changed to evident.
• Page 214: drop to O (capital o) changed to drop to 0 (zero).
• Page 248: actual from a common changed to actuated from a common.
• Page 256: values changed to valves.
• Page 280: Fig. 6 changed to Fig. 112.
• Page 306: Fig. 127, B changed to Fig. 127, C (2nd reference).
• Page 324: Rhone changed to Le Rhone as elsewhere.
• Page 334: Check values changed to Check valves.
• Page 364: LeRhone changed to Le Rhone as elsewhere.
• Page 390: Fig. 62, D changed to Fig. 168, B.
• Page 408: Stilson changed to Stillson as elsewhere.
• Page 490: both valves changed to both halves.
• Page 514: standard ratio is 5.3 changed to standard ratio is 5:3.
• Page 529: gallons per minute 1,400 R. P. M. changed to gallons per minute at 1,400 R. P. M.
• Page 546: Hispano Suiza changed to Hispano-Suiza as elsewhere.
• Page 556: Diameter of crank-shaft, 56 mm. changed to Diameter of crank-shaft, 55 mm.
• Page 7 (advertisements): Hazlehurst Field changed to Hazelhurst Field.
• Page 21 (advertisements): Rhose Island Compound changed to Rhode Island Compound.
• Index: Shebler changed to Schebler, camshaft changed to cam-shaft, wristpin changed to wrist-pin, etc. (all as in text).