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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.