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Ingenious apparatus for observing Brownian motion in smoke particles. Great for physics classrooms studying kinetic theory All optical components ...

Economical, attractive wind vane with bearing mounted on steel pivot and direction indicator. Fitted on cast iron base. With bearings mounted on s...

Comprising a cylinder 200 x 30 mm diameter one-half of which is wood, the other metalComprising a cylinder 200 x 30 mm diameter one-half of which i...