Счётная машинка 1666 года
Вот так вот считали в далёкие времена))) А то всё абак, да абак... Даже стилус есть для удобства!
Оригинал взят у kardiologn в Счётная машинка 1666 года
Morland's calculating machine, engraved "Samuel Morland
Object Name: adding machine (stylus)
Place Made: England, United Kingdom. Date Made: 1666-1680
Morland, Sir Samuel
Nationality: English
Brief Bio: first baronet, 1625-1695, diplomatist; natural philosopher; mathematician; inventor, English
Notes: Devised a large number of improvements and inventions, for example, plunger pump (1675), speaking trumpet (1671), perpetual calendar, calculating machine, naval gun carriage, drum capstan, device for opening letters without breaking the seals;
Morland published 'A New Method of Cryptography' (1666), 'The Description and Use of Two Arithmetick Instruments' (1673), 'Perpetual Almanack and Several Useful Tables' (1673) and 'Doctrine of Interest both Simple and Compound' (1679).
served as the King's Master of Mechanics;
baronetcy 1660
1666, he also obtained a patent for making metal fire-hearths
Источник: http://collectionsonline.nmsi.ac.uk/