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wood prints book wood prints candle wood prints diagram wood prints text wood prints eye wood prints observation wood prints publication wood prints page wood prints astronomy wood prints history wood prints physics wood prints optics wood prints illustration wood prints black-and-white wood prints monochrome wood prints

photographs book photos candle photos diagram photos text photos eye photos observation photos publication photos page photos astronomy photos history photos physics photos optics photos illustration photos black-and-white photos monochrome photos

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Galileo's theories of observations from 'Il Saggiatore' (1623, 'The Assayer'). This work by Italian astronomer Galileo Galilei (1564-1642), was about comets and contained treatises on natural philosophy and mathematics. The illustration on this page shows the optics of a human eye observing a candle flame, with the accompanying text talking about observations made of stars using a telescope.

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