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John Dollond
1706 - 1761
John Dollond, (born June 10, 1707, London, Eng.—died Nov. 29/30, 1761, London), British maker of optical and astronomical instruments who developed an achromatic (non-colour-distorting) refracting telescope and a practical heliometer, a telescope that used a divided lens to measure the Sun’s diameter and the angles between celestial bodies.
"John Dollond." Encyclopaedia Britannica. Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc., 2014. Web. 12 Sep. 2014. <http://www.britannica.com.ezp-prod1.hul.harvard.edu/EBchecked/topic/168291/John-Dollond>.
Gloria Clifton, ‘Dollond family (per. 1750–1871)’, Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, Sept 2013 http://www.oxforddnb.com.ezp-prod1.hul.harvard.edu/view/article/49855/7782?docPos=1, accessed 12 Sept 2014]