faber castell 2/83N
| this castell is not in perfect condition. usual wear and
some fading of colors. it is still highly usable, however, and a most
interesting rule to operate.
it is festooned with scales on the front here and on the back. |
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| the right end shows the extensive scales on the front. two
sets of tan(x), differential pi scales, reciprocal and reciprocal pi and pythagorean,
as well as usual c & d, square, cube, sin(x) and ST. |
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| this is the back! its almost as packed as the front.
extensive log scales here and repeated c & d from the front.
rather cool is the w1 & w2 scale which are a folded 20" root
scale onto 10" (hence two scales). use these the same as c & d,
but more accurate. |
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