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A member at Instructables asked me to explain how to use a slide rule for the sake of those who came along about the time electronic calculators repla...
Before using a slide rule new to you there is a preliminary check for accuracy that should be made. The inscribed line for the "1" on the A scale shou...
Locating a number on the scales of a slide rule is very much like reading any ruler. But, there are a couple of things that can be tricky and will nee...
The graphic has zoomed in on the left portion of the C and D scales. Notice the thin black line that crosses the graphic from top to bottom. This is c...
The graphic shows the C and D scales at the right end of the rule. The hairline marks 958, or perhaps 959. The difference between those two numbers am...
Now it is time to do an actual multiplication problem on the virtual slide rule. You can replicate this by going to the link for the virtual slide rul...
This step will illustrate two things. First, it will show the multiplication of two numbers with far more digits than a simple 2 x 2 problem. The numb...
Where to put the decimal point need not hang threateningly over our heads. A common and easy way to estimate where to place the decimal point is to do...
Division on a slide rule involves the exact steps used in multiplication on the C and D scales, but in reverse order. Look at the graphic used earlier...
Most slide rules include a C1 scale. It is identical to the C scale, but in reverse so that the numbers ascend from right to left, rather than from le...
If five widgets fit into three quarks, how many widgets would fit into 13 quarks? That is a proportion problem. 5 is to 3 as x is to 13. It can be wri...
Sometimes you need to know the reciprocal of something. That means you want to know what 1 divided by a number is. The C1 scale makes it easy. Just fi...
The A or B scale is used in conjunction with the C or D scale for quickly finding the square or square root of any number. If you look closely at the ...
Notice the K scale at the very bottom of the virtual slide rule. It is three copies of the C and D scales made smaller and laid end to end. It can be ...
The first graphic shows the reverse side of the virtual slide rule. The C and D scales are where you have come to expect them from the other side of t...
Trigonometry allows you to solve triangles. It requires a right triangle, that is, a triangle with one 90 degree corner. If you are solving a triangle...
In the previous step, I viewed the top of a tree through a camera with a telephoto lens tilted to 61 degrees. I did this from a distance of 40 feet. B...
The slide rule has scales for Tangents and for Sines. But, there are also Cotangents, Cosines, Secants, and Cosecants. The scales for Sines and Tangen...
I wish my problem in which I needed to determine the height of the tree had involved Sines because Sines are easier to determine on the slide rule tha...
Exponents are logarithms. Exponents for base 10 were discussed in step 7 as part of scientific notation and knowing where to locate the decimal point ...
By means of Facebook and e-mail contacts I often need to covert temperatures in Fahrenheit to Celsius, and vice versa. You can just type "25 degrees C...
Most who will want to learn to use a slide rule now will do it out of nostalgia. Their father may have used a slide rule during his engineering career...
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Jan 2, 2012
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