BB Board Overhead Projection Device


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BB Board Overhead Projection Device
HS-12

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With this device, one can demonstrate the slip planes, dislocations, and defect holes in a two-dimensional array of more than 1,000. There is a one-to-one correspondence between annealing, hardening and tempering of a steel bobbie pin and the projected model of sphere packing. More than 5000 of these devices have been constructed at teacher workshops throughout the country. Complete instructions for using are included.

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