In a recently completed review of over 3,000 Curatorial accession files, funded by a grant awarded by the Institute of Museum and Library Services, Museum staff discovered that we have a rare navigation instrument, a “Townshend Double Reflecting and Repeating Circle.”  A reflecting circle is a device for measuring longitude that was more accurate than the sextant. It was developed in the 18th … Continue reading Charle’s Hervey Townshend’s Double Reflecting and Repeating Circle