Talk:Pascal's calculator

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The intersection of two perpendicular cylinders is one point[edit]

This entry is in response to the removal of this statement by 108.1.194.70
if you go to the All Elementary Mathematics - The Mathematical Web High School page titled:
Tangent plane of a ball, a cylinder and a cone, retrieved today,
figure 96 shows the intersection of a cylinder and a plan which is one line in this case MN. Now take another Cylinder intersecting another plan and their intersection M'N', position the cylinders perpendicularly and touch the planes, MN and M'N' cross in one point. QED.
Ezrdr (talk) 10:03, 14 November 2012 (UTC)[reply]

chupa me lo — Preceding unsigned comment added by 66.76.66.131 (talk) 13:58, 2 October 2013 (UTC)[reply]

Looking at the centre lines of the cylinders, I would call them skew lines and not perpendicular. Here's the intersection of two cylinders (at the centre). — Preceding unsigned comment added by 67.193.104.221 (talk) 08:46, 3 March 2015 (UTC)[reply]

Plastic versions[edit]

Sterling Products' "Add-it" had some popularity in the mid 20th century. IBM even marketed a hexadecimal version for code checking. knoodelhed (talk) 21:03, 6 March 2016 (UTC)[reply]

Talking Heads[edit]

The two paragraphs concerning 'talking heads' have nothing to do with mechanical calculators. In particular the bracketed statement "(binary arithmetic)" is entirely unsupported - limiting the head to yes/no answers is not binary arithmetic, and there is no other evidence of binary arithmetic being used in the sources given.

I have removed the bracketed statement, and I would further suggest the two paragraphs are removed from this article.Armulwp (talk) 09:42, 19 February 2017 (UTC)[reply]

External links modified[edit]

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Nine's complement, nines' complement, or nines complement?[edit]

Donald Knuth recommends placing the apostrophe after the 's' when referring to the diminished radix complement of base n+1 (e.g. nines' complement is the diminished radix complement in base 10), and placing the apostrophe before the 's' when referring to the radix complement of base n (e.g. ten's complement is the radix complement in base 10). See Numeric complements. The Ones' complement and Two's complement articles also follow this convention. However, as mentioned in Numeric complements, "Most writers use one's and nine's complement, and many style manuals leave out the apostrophe, recommending ones and nines complement." --Ebichu63 (talk) 16:42, 10 January 2024 (UTC)[reply]