Record

Reference numberMOB/026
LevelItem
TitleHeliometer by John Dollond
Datec.1754
DescriptionBrass heliometer with a split lens, one half fixed, the other attached to a micrometer screw for sliding along the cut diameter. A plaque at the base inscribed 'Royal Society 2.0'. Originally developed for measuring the angular diameter of the Sun, this instrument was later adapted to make precise measurements of star positions, and often used in conjuction with James Short's telescopes. Created by John Dollond.
Extent1 instrument
FormatScientific Instrument
MaterialsBrass, glass
NotesCurrently on loan to the Science Museum - on display in the 'Science City' exhibition
Access statusOpen
ProvenanceExact provenance unknown, ikely donated/beqeuathed to the Society by Dollond
Related materialThe benefits of a split lens described by Dollond in his paper 'XIV. A letter from Mr. John Dollond to Mr. James Short, F. R. S. concerning an improvement of refracting telescopes', Philosophical Transactions vol 48 (1753)
Fellows associated with this archive
CodeNameDates
NA8205Dollond; John (1706 - 1761)1706 - 1761
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