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What do the numbers mean?
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enter number for C1 to be over:
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C1 is considered an "index". There are two of them
on the C scale. The C scale is on the bottom
part of the set of scales that slide and is marked on the left side
with the letter "c". This scale is usually placed over
the multiplicand
in a multiplication problem. So, in the number beside this text,
you might want to enter a number such as 3 if you want to
multiply 2x3. If you do, then the answer will be found on the
scale marked at the end with a "d" (referred to as the
D scale) below the 3 on the C scale.
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enter number for C [ ] over D [ ]
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This is often a function used for division, in which a
divisor
on the C scale is placed over a
dividend
on the D. The answer will be found below C1 on
the D scale. You can also see that answer in the second
box marked, "C1 now over".
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Finally - what do the numbers mean?
The interesting thing about the slide rule, is that any one
number can mean lots of different things, by just adding
zeros, or moving a decimal point around. For example, if you
enterd 2, 2000, or .02 in the first box and pressed the
button, the C1 index would move the exact same spot
each time. Rather than carrying around a slide rule for
1's, 10's, 100's, 1000's, and more, you just allow the number
to be whatever "fits" the problem you are doing. So, if you
want to multiply 2x3, you put C1 over 2, and look for
the answer below C3 on the D scale. you would do
the exact same thing for 20x30, or 2x300. The answers to those
problems are, 6, 600, and again 600.
You can enter whatever you want in the boxes, and the slide
rule will move to the correct location.
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