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A tool made from bone, with a quartz tip and scratches that may be as tally marks for counting.
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A counting and calculating tool used by merchants and clerks before written numerical systems.
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An advanced inclinometer, used for measuring the position of the sun, stars and planets.
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The first general purpose mechanical computer, designed by Charles Babage.
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Mechanical device for registering and calculating transactions with a cash drawer for storing money.
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The world's first electronic digital computer that was at all programmable.
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An early 'stored-program' computing machine developed to test the first computer RAM.
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A wristwatch that shows the time as a number using electronics rather than mechanics
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A phone that can make and receive calls while moving around.
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A hand held tablet device with a touch screen, camera, microphone, wifi and mobile phone connection.
