Fowler's
Long Scale Calculator

    While not exactly a slide rule, this device operates on logarithms and moveable scales so I've decided to include it here.

    This device has scales and fixed indices on both sides of it, and a moveable index on one that's linked to the scale on the opposite side. The two knobs control the two moving scales.

    Thanks to the kindness of several folks, I now have a reproduction of the owner's manual and a wealth of other data on this device. Fowler's manufactured at least three different models of calculator; the one I have is the "Vest Pocket Long Scale" model, the others were the "Universal" and the "Magnum". I'm still digesting this, and once I get a decent handle on it will post my own set of instructions here.

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