Slide Rule Cache Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(regular)
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Puzzle cache requiring understanding of the operation of a slide
rule
The posted coordinates are bogus; they mark the intersection of
Post and Majors roads. Note that Post was a major
manufaturer of slide rules before the advent of calculators.
The cache is located at N AA B0.CC W DD
EE.FF
The latitude AA B0.CC is calculated using a straight slide rule
which is 10” between the left and right ‘1’ index marks, with the C
scale in the central slide and the D scale stationary (the stator).
For each calculation the index marks are aligned at the start.
AA: The cursor is moved 5.3148 inches to the right of the
leftmost mark on the D scale. Read AA from where the cursor
intersects the D scale. If you do not obtain a value of 34, then
your math calculations are not up the rest of the puzzle.
B: The slide is moved 3.0103 inches to the right. From the
left index of the C scale, the cursor is moved right 6.9897 inches,
and the value of B is read from the D scale.
CC: The slide is moved left 2.2185 inches; the cursor is
placed over the value 2.5 on the C scale and the value is read from
the D scale.
The longitude is computed using a circular slide rule with the C
scale on the inner moveable wheel and the D scale on the stationary
outer ring. Each calculation begins with the indexes and cursor
aligned.
DD: The cursor is moved 5.8074 radians clockwise, and the
value is read from the C scale. If you do not get DD=84, recheck
your math.
EE: The interior wheel is rotated counter-clockwise 3.7829
radians. The cursor is rotated clockwise 2.9978 radians, and the
value of EE is read from the C scale.
FF: The C scale is rotated clockwise 100.348 degrees. The
cursor is moved over the 3 mark of the C scale and FF is read from
the D scale.
This will remain a members-only cache until first found or 30 days,
whichever comes first.
Parking is available .2 miles from the cache at a true bearing of
19 degrees. Do not park anywhere else.
Initial contents include both straight and circular slide rules, a
$WG, and several kid-friendly items.
Access to the cache involves some scrambling and may involve mild
bushwhacking or wading, depending on your approach.
Additional Hints
(No hints available.)