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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.