Aelfwine is correct that Tolkien did not have a calculator and I expect that he did the calculations by hand, long division, etc. https://en.wikipedia.org/wiki/Long_division

He may have also used a slide rule (https://en.wikipedia.org/wiki/Slide_rule) or Log Tables (https://en.wikipedia.org/wiki/Mathematical_table).

Finally, I doubt that he would have owned one of these, but the University would have had mechanical calculators (https://en.wikipedia.org/wiki/Mechanical_calculator) so he possibly could have used one, but very unlikely as they were not simple to use.

I have put an "Addenda and Corrigenda" for The Nature of Middle-earth on the web here. Please spread the word, and please send me any additional corrections you notice. Thanks!

Thank you Carl, excellent work. I will use these to update my eBook edition and my working copy of the hardcover.

Thank you Aelfwine!

(Small note - there is no link yet to the pdf file from the errata page itself, https://elvish.org/errata/ )

I'm continuing to work on my paragraph referencing scheme (less important here because of only a single pagination but still useful for certain work) and I'll map the errata locations to that once I'm done.

Bookdepository have a listing for a US paperback on the 28th February 2023.

https://www.bookdepository.com/The-Nat ... F-Hostetter/9780063269606

Format Paperback | 464 pages
Dimensions 139.7 x 209.55mm
Publication date 28 Feb 2023
Publisher HarperCollins
Imprint William Morrow & Co
Language English
ISBN10 0063269600
ISBN13 9780063269606

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The Nature of Middle-earth PB (2023)

William Morrow Paperbacks (2023-02-28)

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$21.99 Amazon.com (Paperback) - Availability: Now

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Have added to the store, under "forthcoming"

The Easton Press release of The Nature of Middle-earth is now on their web site for ordering:

https://www.eastonpress.com/all-catego ... of-middle-earth-3812.html

One of the more expensive EP volumes at $196...Still getting it though.

Which means at least 500 thru ebay for us lonesome Aussies.