Unitas Calculator Checking out a Very old Design Eps 1

In this video I work on a very old Mechanical Calculator that was made likely about 1910 – 1913. Its history I discover and present in the video. It's really quite a remarkable machine, its history and background is quite interesting. I manage to get the machine cleaned, lubricated and going again.
Links for stuff mentioned in the video:
Pikes Peak Trolley Museum, web page at: https://coloradospringstrolleys.com/
Smithsonian Institution photo links of the Unitas at: https://www.si.edu/object/nmah_690666
Thomas Arithmometer, earliest surviving example: https://www.si.edu/object/nmah_690692
Thomas Arithmometer, production example: https://www.si.edu/object/nmah_690683
Many of the drawings in this video and references come a book available at Archive.org The book is titled Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition. It's available for free at at: https://archive.org/details/moderninstrument00horsuoft/page/n8
German Calculator article at: http://www.rechnerlexikon.de/fr/upload/b/b1/Anthes-Reese-HBw-100-2015-S3-S14.pdf
French web site on the Thomas machine history at: http://www.arithmometre.org/
This video describes in detail how the Arithmometer works: https://www.youtube.com/watch?v=nyCrDI7hRpE
The background music is from the Audio Library – YouTube , the title is Lifting_Dreams.mp3
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