gn them to calculate the product of two numbers. </p>

<h3>The Slide Rule</h3>
<ul>
	<li><b>Cursor</b> is a glass indicator.</li>
	<li><b>Black scales</b> increase from left to right.</li>
	<ul>
		<li><code class='scale'>C</code> & <code class='scale'>D</code> scales are single (1-10) scales.</li>
		<li><code class='scale'>A</code> & <code class='scale'>B</code> scales are double (1-10-100) having two cycles</li>
		<li><code class='scale'>K</code> is triple (1-10-100-1000) having three cycles</li>
	</ul>
	<