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Popular scientific lectures ⠃⠗⠋ 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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566,524 braille cells · 598 embossed pages at 40×25 · 4,372 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.