Knotting and Splicing Ropes and Cordage, Paul M. Hashuk—Cassel & Co., New York.

Knots, A. F. Aldridge, The Rudder Pub. Co., New York.

Knots, Splices, and Rope Work, A. Hyatt Verril,—Norman W. Henly Pub. Co., New York.

Rope and its Use on the Farm, J. B. Frior—Ag. Exp. Sta. Bul. No. 136, Univ. of Minn.

Knots, Hitches and Splices, Howard W. Riley, Cornell Reading Courses, New York State College of Agriculture, Ithaca, New York.

Story of Rope, Plymouth Cordage Co., North Plymouth, Mass.

Rope Knots and Hitches, MacGreggor Smith, College of Agriculture, Univ. of Saskatchewan, Saskatoon, Canada.

Problems in Physics, War Department Committee on Education and Special Training, Washington, D. C.

Kent’s Mechanical Engineers Hand Book, John Wiley & Sons, New York.

Encyclopedia Britannica.

Rope and Its Uses, Iowa State College of Agriculture and Mechanic Arts.

American Wire Rope, American Steel and Wire Company.

Boy Scout Manual.

Engineer Field Manual, Fifth Edition, Government Printing Office, Washington, D. C.

Rope Work, L. M. Roehl, The Bruce Publishing Co., Milwaukee, Wis.

R. O. T. C. Engineer.

Columbia Knots and Splices, Columbia Rope Co., Auburn, New York.

American Boy Magazine—July 1917.