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Popular scientific lectures ⠃⠗⠋ braille edition

Grade 1 — uncontracted, letter-for-letter. Translated on this server by our own braille engine (BRF — Braille Ready Format, Library of Congress fdd000551). View Grade 2 instead.

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672,558 braille cells · 715 embossed pages at 40×25 · 1,972 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.