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Re: Ruminatons on Bygrave and Hohenrechenschieber scale markings
From: Brad Morris
Date: 2013 Feb 24, 15:09 -0800

Hi Robin

The degree symbol does indeed touch the "F" tick mark at 80 and at 82 degrees, or rather the complementary 100 and 98 degrees. The reason for this is quite obvious. The seam for the scale cramps the complementary angle into a tight space.

Another odd seam denotation is right below. at 102d30m, the minutes symbol is above the "E" tick mark. Elsewhere, it appears to the left of the "E" tick mark. The 1 in 102 is actually straddling the seam. That is, the number one symbol is only that when the seam is closed to its other side. When not closed, the number 1 symbol is split vertically

12d30m has the 0 in 30 chopped in half without any minutes symbol.

While not particularly strange, the seam run sight between digts at 24d and at 114d.

++++++
The cosine scale seems to avoid seam issues (pun fully intended). In this scale, there are some denotations that are on the seam, yet the photo artwork is carried across without issue.

So it appears that the cosine scale was executed with better patterns in tick marks and denotations. It also dealt with the seam issues in a more sensible manner. Could this indicate that the cosine scale was executed after the (co)tangent scale?

Best Regards
Brad
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