[Description of a machine for teaching blind persons arithmetic] / [Thomas Grenville].

  • Grenville, Thomas, 1755-1846
Date:
[1793?]
Catalogue details

Licence: Public Domain Mark

Credit: [Description of a machine for teaching blind persons arithmetic] / [Thomas Grenville]. Source: Wellcome Collection.

    5/24 (page 129)
    [ 129 3 polite arts* In the Tear 1770, Mr. Thomas Gren¬ ville, the Inventor of the Machine for teaching Blind Ferfons Arithmetic9 de¬ ferred in the following Pages> attended\ and worked feveral Sums in Addition, Multiplication9 and Divi/ion; and the Society, conf dering the Contrivance as new9 fimple in its Conf ruction 9 very ingenious9 and likely to prove of great Utility to Ferfons labouring under the Misfortune of being Blind, voted Mr. Grenville a Bounty of Fifteen Guineas9 on Condition he left with the Society a complete Machine I and