Brady and Keith look at three aerial telescope lenses - built in the 17th Century by Christiaan and Constantine Huygens.

Films by James Hennessy and Brady Haran

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Some keywords: aerial, telescope, lenses, 17th century, Christiaan, Constantine, Huygens, Dutch, instrument makers, Victorian mount, Warren De La Rue, imperfections, bubbles, flat, Isaac Newton, achromatic compensation, Hall, Dollond, Gilbert Burnet, Robert Hooke, Gresham College, quadrangle, diagram, mast, pulleys, string

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