More than a Manual: Early-Modern Mathematical Instrument Books

In Elizabethan London, one of the more surprising things a wealthy owner of a beautifully illustrated folio volume could do was to take a sharp knife and cut it to pieces. John Blagrave’s 1585 Mathematical Jewel, in fact, demands nothing less.[1] This work, which introduced an elaborate instrument of Blagrave’s design for performing astronomical calculations, included woodcuts that were specifically provided in order to be cut out and used as surrogates for the brass original:

get very fine pastboord made of purpose, and then spred your paste very fine thereon, & quickly laying on this picture & clappe it streight into a presse before it bee thorowe wette with the paste (fol. ¶6v)

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Spinning the Risk: ‘The Effects of Nuclear Weapons’ Handbook

The Effects of Nuclear Weapons was by far the most popular handbook of nuclear defense during the Cold War. Adapted from an original publication of the Los Alamos Scientific Laboratory (1950),[1] the handbook was amended and made commercially available for popular use (1957),[2] revised (1962),[3] reprinted (1964),[4] expanded (1977),[5] and even illicitly translated into Russian for use in the Soviet Union (1960).[6] Edited by Samuel Glasstone, a prolific author of science textbooks, The Effects of Nuclear Weapons was described as a “comprehensive summary of current knowledge on the effects of nuclear weapons” and commended by the Federal Civil Defense Administration as “the definitive source of information on the effects of nuclear weapons.”[7] Continue reading “Spinning the Risk: ‘The Effects of Nuclear Weapons’ Handbook”

Handbooks of the Mind into Ready Reckoners in Print: The Story of the ‘Encuvati’ in the Nineteenth Century

The Encuvati was the quintessential Tamil multiplication table book, used in precolonial South Indian schools. Nowadays they are available as palm leaf manuscripts, collected from different geographical locations of the Tamil-speaking region of South India and stored in various manuscript libraries there as well as in other collections inside and outside the country. But why is something as innocuous as a multiplication table book important for us? Their contents look nothing like modern tables, with lines and columns, but the numbers are arranged the same way. Their importance emerges from the simple fact that countless children participated in their making from about the seventeenth century, if not earlier. Continue reading “Handbooks of the Mind into Ready Reckoners in Print: The Story of the ‘Encuvati’ in the Nineteenth Century”