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Title: six Barton's buttons, (speculum metal ruled with a diffracti [Go to resource]
Description: six Barton's buttons, (speculum metal ruled with a diffraction grating pattern), made by John Barton, London, c. 1830, in red leather box, marked No 11, lined with velvet and silk. diameter of buttons, minimum to maximum size is 20-23 mm License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: diffraction grating - reflection Temporal: 1825-1835 Source: Science Museum Creator: Barton, John Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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