[posted] Posted (#68394, Trouvelot) !

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The Trouvelot astronomical drawings manual, by Étienne Léopold Trouvel 68394
  [Full title: The Trouvelot astronomical drawings manual]
  [Full author's name: Étienne Léopold Trouvelot]
  [Author: Étienne Léopold Trouvelot]
  [Link: https://www.gutenberg.org/6/8/3/9/68394]
  [Files: 68394-0.txt; 68394-h.htm]

Thanks to Laura Natal Rodrigues (Images generously made available by Hathi
Trust Digital Library and Wikipedia Commons.)

Regards,
Al