The Why and How of HOC collecting. My personal take on this fascinating hobby.

Links and Resources. Other sites with HOC exhibits and knowledge.

Start Here to view the HOC exhibition item by item, or click any exhibit below.

	The enigmatic Spirule		Magnetic core memory		Gravet Lenoir slide rule		A Mathematical Robot		Flight computer
	Not a Toy!...		A curious hybrid		Correntator slide adder		Odhner Pinwheel Calculator		Ivory Sector
	Hard Fonts		Mahogany and Glass		The first PDA		Computer with a dial		Fowler's circular slide rule
	Chenevier's Memento		Software by the yard		A Victorian "Calculator"		A Bill full of holes		Enter the Altair!
	Homemade hydrological rule		The incredible Curta		ALKU glass slide rule		Iron Felix calculator		El Calculador!
	Stephens' Supremathic		Psychrometric slide rule		Chesterman's Cattle Gauge		Thacher's monster slide rule		Joe Gerber's pajamas
	The Bare Bones Hemmi No. 22		Beautiful Digits		Blue Velvet		Just a couple of relays		The Xeroxed calculator
	Black Gem		Locke's adder		Farmar's profit calculator		Kaufmann's Posographe		Hand wired memory!
	Piercing the unknown		Ken+Add adder		Michaelis's calculator		Biorhythmic calculators		Webb's Adder