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housings and plain shaft bearings; gears and gearing; ball or roller screws; gear boxes and other speed changers, including torque converters; flywheels and pulleys, including $ . m $ . m $ . m $ . m taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats or the like, including...
the astrolabe . besides geometry, hipparchus also used arithmetic techniques developed by the chaldeans . he was one of the first greek mathematicians to do this, and in this way expanded the techniques available to astronomers and geographers. there are several indications that hipparchus knew spherical...
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