# What is a slide ruler?

Long before people relied on calculators for computing numbers, there was the slide ruler, which is also called a slide rule. The slide rule has evolved over the centuries, and there are many diffe... Read More »

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## Who invented the slide ruler?

According to Robert Graf Derrenberger in "A History Of The Slide Rule," the person credited with inventing the slide ruler is the Rev. William Oughtred in 1622. However, Oughtred was building on t... Read More »

## What Is the Difference Between a Regular Ruler & a Metric Ruler?

When you need to measure an object's dimensions, such as a section of cardboard that you want to cut to a specific length and width, you can use a ruler to find its size. If your task requires you ... Read More »
http://www.ehow.com/info_8164931_difference-regular-ruler-metric-ruler.html

## How to Slide Down a Water Slide Without Anything On?

Youâ€™ve probably pulled your shorts/bikini bottoms down once, just slightly, so you could slide down the public poolâ€™s slide faster. But taking the next step and doing it all naked, takes a lot ... Read More »
http://www.wikihow.com/Slide-Down-a-Water-Slide-Without-Anything-On

## How to Show the Slide Number and Total Number of Slides on Every Powerpoint Slide?

It's easy to display the current slide number and total number of slides on your PowerPoint presentation. Please see steps below to get started.
http://www.wikihow.com/Show-the-Slide-Number-and-Total-Number-of-Slides-on-Every-Powerp...

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