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Observation by Bill Barton: More on BAA Instrument 169

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Bill Barton


Bill Barton


2020 Jan 09 - 07:56


2020 Jan 09 - 07:56




More on BAA Instrument 169

About this image

Carriage movement registering counter on left (circle calibrated 0-10-20-30-40), single micrometer screw on extreme left.

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