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Line 1: − [[File:Sliderule.jpg]] − − == Where to get Sliderule == − − [http://activities.sugarlabs.org/en-US/sugar/addon/4222 Activity] | [http://git.sugarlabs.org/projects/slideruler/repos/mainline Source] − − == About Sliderule == − − [[File:Sliderule-activity-icon.png]] − − − "The [http://en.wikipedia.org/wiki/SLiderule slide rule] also known colloquially as a slipstick, is a mechanical analog computer." This Activity implements a basic slide rule with C, D, A, and L scales and can be used for multiplication, division, roots, addition and subtraction. − − <gallery> − File:SlideruleC.png|The C and D scales are used for multiplication and division. − File:SlideruleA.png|The A and D scales are used for squares and square roots. − File:SlideruleL.png|The L scales are used for addition and subtraction. − </gallery> − − A nice discussion of the slide rule is found here [http://www.ryereflections.org/servlet/pluto?state=3030347061676530303757656250616765303032696430303438373235] − − === The toolbars === − − [[Image:SLiderule-main-toolbar.png|right]] − − From left to right: − * project-toolbar button − * C scale (multiplication and division) − * A scale (square and square root) − * L scale (addition and subtraction) − * display of calculation and results − * stop button (not shown) − + − + − <gallery>+ − + − </gallery>+ + + − + − − '''Example:''' 4+3+5+19+24=55 + − + + Line 64:
Line 34: − − ==Discussion== − − − [[Category:Activities]]
no edit summary
== How to use a slide rule ==
== How to use a slide rule ==
There are three parts to the slide rule: (1) a fixed rule (either the D scale or the L scale); (2) a sliding rule (the A, C, or L scales); and a reticule, which moves independently of the rules.
'''Examples:''' In the gallery below, several simple examples are shown.
To move the sliding rules, simply drag them. Also to move the reticule, drag it. ('''Note:''' The entire slide rule does not fit on the screen. By dragging on the fixed rule, you can scroll the canvas to reveal different sections.)
Most calculations on a slide rule require three steps:
# position the end of the top slide above a number on the bottom slide;
# position the reticule over a number on the top slide;
# read the result from the bottom slide.
The Sliderule Activity displays these three values on tabs attached t the top slider and the reticule. The calculation is also displayed on the activity toolbar.
=== Multiplication ===
=== Multiplication ===
To multiply...
To multiply, first position the end of the C slide over one of the multiplicands on the D slide. Then position the reticule over the other multiplicand on the C slide. Read the result off of the D slide.
'''Example:''' 2 × 1.31 = 2.62
<gallery>
<gallery>
File:Sliderule-2D.png|Position the end of the C slide over 2 on the D slide
File:SLiderule-1.31C.png|Position the reticule over 1.31 on the C slide
</gallery>
</gallery>
=== Subtraction ===
=== Subtraction ===