"Series of Lectures on Galvanic Batteries, Electric Machines, Torpedo Fuses, Explosives, Whitehead Torpedoes, Submarine Boats, Liquid Carbonic Acid. 1874-1875" http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2908302045&category=12573 Sounds like an interesting book. Does anybody know what Carbonic Acid was used for? Ian.