William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier. Before the advent of the pocket calculator, it was the most commonly used calculation tool in science and engineering. The use of slide rules continued to grow through the 1950s and 1960s even as digital computing devices were being gradually introduced; but around 1974 the electronic scientific calculator made it largely obsolete Introduction to the Slide Rule
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William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier. Before the advent of the pocket calculator, it was the most commonly used calculation tool in science and engineering. The use of slide rules continued to grow through the 1950s and 1960s even as digital computing devices were being gradually introduced; but around 1974 the electronic scientific calculator made it largely obsolete
If we look at the powers we can see that 3 + 4 = 7It becomes a multiplication because 23 x 24 = 27
Or a division because 27 ÷ 23 = 24
This is a simplified slide rule with just the two scales: Click here
This is complete slide rule (Use the A&B scales which go up to 100 or C&D scales which go up to 10): Click hereIf you Flip the middle scale (see top right of the Slide Rule) you can see some convenient conversion scales.