Three circular diagrams, the central of which is a table in red and black, likely for determining the date of Easter. The lower diagram appears unfinished, while the upper circle contains a line drawing in brown of two Franciscan friars and an angel (London, British Library, MS Harley 3734, f. 1v). (via How Did We Choose Our Harley Science Manuscripts? - Medieval and Earlier Manuscripts)
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Three circular diagrams, the central of which is a table in red and black, likely for determining the date of Easter. The lower diagram appears unfinished, while the upper circle contains a line drawing in brown of two Franciscan friars and an angel (London, British Library, MS Harley 3734, f. 1v). (via How Did We Choose Our Harley Science Manuscripts? - Medieval and Earlier Manuscripts)

Source: britishlibrary.typepad.co.uk

The Atlas of the United States Printed for the Use of the Blind was published in 1837 for children at the New England Institute for the Education of the Blind in Boston. Without a drop of ink in the book, the text and maps in this extraordinary atlas were embossed heavy paper with letters, lines, and symbols. To the best of our knowledge, this is the first atlas produced for the blind to read without the assistance of a sighted person. Braille was invented by 1825, but was not widely used until later. It represented letters well, but could not represent shapes and cartographic features. (via David Rumsey Historical Map Collection | Atlas for The Blind 1837)
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The Atlas of the United States Printed for the Use of the Blind was published in 1837 for children at the New England Institute for the Education of the Blind in Boston. Without a drop of ink in the book, the text and maps in this extraordinary atlas were embossed heavy paper with letters, lines, and symbols. To the best of our knowledge, this is the first atlas produced for the blind to read without the assistance of a sighted person. Braille was invented by 1825, but was not widely used until later. It represented letters well, but could not represent shapes and cartographic features. (via David Rumsey Historical Map Collection | Atlas for The Blind 1837)

Source: davidrumsey.com

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