Talk:Genaille–Lucas rulers

Are the Pictures a joke? They've been up for a couple edits now. — Preceding unsigned comment added by 98.164.210.26 (talk) 02:13, 1 July 2011 (UTC)

the how of this
would it be possable to add a secton explain the resoning behind the gray trangles in this123.211.231.129 (talk) 12:55, 23 April 2010 (UTC)

The grey triangle is a graphical representation of the carry. For example, if you are multiplying the digits 4 x 9, the result is 36. The "6" is shown as the number on the strip, and the "3" is represented by a grey triangle that pulls you down by 3 rows, so you are effectively adding 3 to the next column. When I get the time, I'll try to explain this more coherently in the article. Or someone else can. --Worrydream (talk) 06:54, 28 April 2010 (UTC)

There is an error in the 7 ruler in the 7 section, the arrow should point to the space between the 9 and 0 not between the 0 and 1. Try multiplying 715 by 7 to see. — Preceding unsigned comment added by 75.72.57.28 (talk) 14:42, 16 January 2013 (UTC)

Easier to use pics
The pics would be easier to use if they had different shadings for even and odd rows.

error in pictures
I'm not savvy enough to fix this easily, but I think there's a typo in the pictures. In the rod with 7 at the top, in the 7th box down (numbered 9 through 5), the triangle break happens between the 0 and the 1, when it should happen between the 9 and the 0 as it always does. Using the pictures gives for example 7*172 = 1104 (wrong) instead of 1204. (This is what happens when you try to make these by hand using the pictures) Staecker (talk) 18:15, 16 November 2015 (UTC)
 * Now I see a comment above from 2 years ago about the same issue. I guess nobody wants to fix it? Staecker (talk) 20:57, 16 November 2015 (UTC)
 * OK I fixed it- wasn't so hard. Staecker (talk) 13:04, 17 November 2015 (UTC)