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Event: Bought Mathematical instruments from the DollondsDates: 1786-04-15 - 1786-04-15Short Description: Jefferson paid 7-2-6 for these mathematical instruments. He bought an achromatic refracting telescope from John and Peter Dollond. Jefferson later used this telescope on April 26 at Dover. He also used this in 1811, along with a great equatorial, to calculate the longitude of Monticello. (TJ Wiki, Longitude) Event Type:Commercial Transaction Record created by Lauren Schmidt Connected PeopleDollond John and PeterConnected EvidenceMemorandum BookThomas Jefferson Wiki Connected TagsMathematical or Scientific Instruments |