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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.