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Dipleidoscope (Dent Patent Meridian Instrument)


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Bill Barton
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Designed to be easier to use than a transit telescope for determining time these instruments first appeared in 1843 and were still being made in the 1870’s.


Len Entwisle's picture

On Googling to expand my historical knowledge I found this set of notes and illustrations by your good self .  Thanks for posting.

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