Interesting I have not seen these photos on any magic later slides or the steroview cards. I wonder what the source was-- some newer archive they did not exist in 1898 when the early magic latern slides & steroview cards were produced?
a bib. on Span Am War Weapons from the above source:
Alger, Prof. P. R., USN, and Twining, Ensign N. C., USN, (The United States Navy Rifle, U.S. Bureau of Ordnance).
Chapel, Charles Edward, The Collector's Handbook of Values. (New York: Coward-McCann, Inc., 1960).
Clerk of Joint Committee on Printing, The Abridgement of Message from the President of the United States to the Two Houses of Congress. (Washington: Government Printing Office, 1899. 4 vols.
Dyer, A. B., Handbook for Light Artillery. (New York: John Wiley & Sons, 1898).
Ezell Edward C., Handguns of the World. (Harrisburg: Stackpole Books, 1981).
Gluckman, Arcadi, United States Muskets, Rifles and Carbines. (Buffalo: Otto Ulbrich Co., Inc., 1948).
Gómez Nunez, Severo, 1899 La Guerra Hispano-Americana. Barcos, cañones y fusiles. Madrid: Imprenta del Cuerpo de Artillería.
Gómez Nunez, Severo, 1902 La Guerra Hispano-Americana. Puerto Rico y Filipinas. Madrid: Imprenta del Cuerpo de Artillería.
Hogg, Ian V., Pistols of the World. Third Edition, (DBI Books Incorporated, 1992).
The Hotchkiss Ordnance Company, LTD, Descriptive Catalogue of War Material, (Factory Catalog, circa 1895)
Howser, Douglas J., "Cuban Republic Insurgents Armed Themselves With Hotchkiss Guns, " The Artilleryman. (Arlington, MA: Cutter and Locke Inc. Vol. 15, No. 2, Spring 1994) 14-17.
Kirkland, K. D., America's Premier Gunmakers: Winchester. (New York: Exeter Books, 1989).
Krausz, John (Editor), "U.S.S. Vesuvius", reprinted from Harper's Illustrated, 1891 in How to Buy an Elephant. (New York: Hawthorn Books, 1977) pp. 155-157.
Mitiuckov, Nicholas, and Patrick McSherry "The Modeled Simulation for Estimating the Effectiveness of Pneumatic Guns," Izhevsk State Technical University Proceedings. 1999, No. 4 (Izhevsk, Russia: Izhevsk State Technical University, 1999) 6 - 9.
Mitiuckov, Nicholas, and Patrick McSherry. “The Fate of a Dynamic Weapon,” Tehnika i vooruzhenie (Technical and Combat Equipment). Part 1, 2003, # 4, 15-20; Part 2, 2003, # 5, 24-26; Part 3, 2003 # 8, 37-40; Part 4 - 2003. - # 10. 26-29
Peterson, Harold L., Encyclopedia of Firearms. (New York: E. P. Dutton and Co., Inc., 1964).
Schreier, Philip, "The Guns of the Spanish American War," Military Classics Illustrated (Los Angeles: Emap USA, 2001).
Watson, Harvey, "The Sims-Dudley Dynamite Gun Received its Test on Cuban Soil", The Artilleryman, (Arlington: Cutter & Locke, Inc., Vol 12, No. 4, Fall 1991, pp. 15-17).