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Origin of modern calculating machines ⠃⠗⠋ braille edition

Grade 2 — contracted English braille (EBAE-compatible subset). Translated on this server by our own braille engine (BRF — Braille Ready Format, Library of Congress fdd000551). View Grade 1 instead.

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195,804 braille cells · 202 embossed pages at 40×25 · 629 unrepresentable characters omitted

⠎⠥⠉⠉⠑⠎⠎⠋⠥⠇⠀⠀⠉⠁⠇⠉⠥⠇⠁⠞⠬⠀⠍⠁⠡⠔⠑⠀⠩⠳⠇⠙⠂⠀⠹⠗⠳⠛⠓⠀
⠦⠀⠉⠕⠝⠞⠁⠉⠞⠀⠾⠀⠮⠀⠞⠗⠁⠙⠑⠂⠀⠉⠕⠍⠑⠀⠀⠞⠕⠀⠮⠀
⠉⠕⠝⠉⠇⠥⠎⠊⠕⠝⠀⠞⠀⠮⠗⠑⠀⠴⠀⠥⠎⠑⠀⠿⠀⠁⠀⠍⠁⠡⠔⠑⠀⠷⠀⠹⠊⠎⠀
⠉⠇⠁⠎⠎⠀⠀⠔⠀⠮⠀⠃⠁⠝⠅⠎⠲⠀⠠⠵⠀⠏⠗⠕⠷⠀⠷⠀⠹⠊⠎⠂⠀⠺⠑⠀⠋⠔⠙⠀
⠞⠀⠁⠝⠀⠁⠏⠏⠇⠊⠉⠁⠞⠊⠕⠝⠀⠿⠀⠁⠀⠀⠗⠑⠉⠕⠗⠙⠬⠤⠁⠙⠙⠬⠀⠍⠁⠡⠔⠑
⠀⠏⠁⠞⠢⠞⠀⠴⠀⠋⠊⠇⠫⠀⠠⠚⠁⠝⠥⠜⠽⠀⠼⠁⠊⠂⠀⠼⠁⠓⠓⠓⠂⠀⠃⠽⠀⠠⠙⠲
⠀⠠⠑⠲⠀⠀⠠⠋⠑⠇⠞⠂⠀⠱⠊⠡⠀⠴⠀⠁⠇⠇⠪⠫⠀⠯⠀⠊⠎⠎⠥⠫⠀⠠⠚⠥⠝⠑⠀
⠼⠁⠁⠂⠀⠼⠁⠓⠓⠊⠲⠀⠀⠀⠀⠠⠊⠇⠇⠥⠌⠗⠁⠞⠊⠕⠝⠀⠀⠀⠀
⠠⠊⠇⠇⠥⠌⠗⠁⠞⠊⠕⠝⠒⠀⠠⠋⠀⠠⠙⠗⠁⠺⠬⠎⠀⠷⠀⠠⠋⠑⠇⠞⠀⠠⠏⠁⠞⠢⠞⠀
⠠⠝⠕⠲⠀⠼⠙⠚⠑⠂⠚⠃⠙⠀⠀⠀⠀⠠⠎⠊⠙⠢⠕⠞⠑⠒⠀⠠⠋⠑⠇⠞⠄⠎⠀⠋⠊⠗⠌⠀
⠗⠑⠉⠕⠗⠙⠬⠀⠍⠁⠡⠔⠑⠀⠀⠀⠀⠠⠐⠎⠀⠷⠀⠮⠀⠙⠗⠁⠺⠬⠎⠀⠷⠀⠹⠊⠎⠀
⠏⠁⠞⠢⠞⠀⠺⠀⠃⠑⠀⠋⠳⠝⠙⠀⠗⠑⠏⠗⠕⠙⠥⠉⠫⠀⠕⠝⠀⠮⠀⠀⠕⠏⠏⠕⠎⠊⠞⠑
⠀⠏⠁⠛⠑⠂⠀⠋⠀⠱⠊⠡⠀⠮⠀⠗⠑⠁⠙⠻⠀⠺⠀⠝⠕⠞⠑⠀⠞⠀⠠⠋⠑⠇⠞⠀
⠉⠕⠍⠃⠔⠫⠀⠦⠀⠀⠎⠡⠑⠍⠑⠀⠿⠀⠗⠑⠉⠕⠗⠙⠬⠀⠾⠀⠮⠀⠍⠑⠡⠁⠝⠊⠎⠍⠀⠷
⠀⠮⠀⠍⠁⠡⠔⠑⠀⠓⠑⠀⠴⠀⠮⠝⠀⠀⠍⠁⠝⠥⠋⠁⠉⠞⠥⠗⠬⠀⠯⠀⠎⠑⠇⠇⠬⠀⠐⠥
⠀⠮⠀⠞⠗⠁⠙⠑⠀⠐⠝⠀⠷⠀⠦⠠⠉⠕⠍⠏⠞⠕⠍⠑⠞⠻⠲⠴⠀⠀⠀⠀⠠⠔⠀⠹⠊⠎⠀
⠏⠁⠞⠢⠞⠀⠊⠎⠀⠩⠪⠝⠀⠮⠀⠋⠊⠗⠌⠀⠁⠏⠏⠇⠊⠉⠁⠞⠊⠕⠝⠀⠷⠀⠮⠀⠞⠽⠏⠑
⠀⠎⠑⠉⠞⠕⠗⠀⠀⠉⠕⠍⠃⠔⠫⠀⠾⠀⠮⠀⠊⠝⠙⠊⠧⠊⠙⠥⠁⠇⠀⠞⠽⠏⠑⠀
⠊⠍⠏⠗⠑⠎⠎⠊⠕⠝⠀⠿⠀⠏⠗⠔⠞⠬⠀⠮⠀⠋⠊⠛⠥⠗⠑⠎⠀⠀⠷⠀⠮⠀⠊⠞⠑⠍⠎⠀
⠵⠀⠮⠽⠀⠶⠀⠁⠙⠙⠫⠂⠀⠹⠥⠎⠀⠛⠊⠧⠬⠀⠑⠟⠥⠁⠇⠀⠊⠍⠏⠗⠑⠎⠎⠊⠕⠝⠂⠀
⠱⠑⠮⠗⠀⠀⠮⠗⠑⠀⠶⠀⠐⠕⠀⠕⠗⠀⠁⠀⠙⠕⠵⠢⠀⠋⠊⠛⠥⠗⠑⠎⠀⠔⠀⠮⠀
⠊⠞⠑⠍⠀⠕⠗⠀⠞⠕⠞⠁⠇⠀⠞⠕⠀⠃⠑⠀⠏⠗⠔⠞⠫⠲⠀⠀⠀⠀⠠⠱⠊⠇⠑⠀⠮⠀
⠁⠧⠻⠁⠛⠑⠀⠍⠑⠡⠁⠝⠊⠉⠁⠇⠀⠑⠝⠛⠔⠑⠻⠀⠺⠳⠇⠙⠀⠝⠀⠁⠞⠀⠁⠀
⠛⠇⠁⠝⠉⠑⠀⠗⠑⠉⠕⠛⠝⠊⠵⠑⠀⠀⠁⠝⠽⠀⠛⠗⠑⠁⠞⠀⠁⠙⠧⠁⠝⠞⠁⠛⠑⠀⠔⠀
⠏⠇⠁⠉⠬⠀⠮⠀⠞⠽⠏⠑⠀⠋⠊⠛⠥⠗⠑⠎⠀⠙⠊⠗⠑⠉⠞⠇⠽⠀⠕⠝⠀⠮⠀

These are the same pages the .brf download embosses — form-feed breaks and all. BRF opens in braille software (Duxbury, BrailleBlaster), on embossers, and on refreshable displays.