xperiments are made of apparatus as much as ideas. Six instruments, each with what it is, where it came from, what was argued about it, and where its logic lives on.

perception and timing

	Weber's compass — two points on the skin, 1830s
	the chronoscope — timing a thought in thousandths of a second
	the tachistoscope — how much is seen in a glance

memory

the memory drum — one syllable at a time, 1894

machines that learn and adapt

	the Mark I Perceptron — learning in wires and motors, 1958
	the homeostat — a machine that rewires itself until it is stable, 1948

nearby