Locke Adder
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| "The
Locke ... patented December 24th 1901 from Kensett Iowa,
... is made of embossed tin and is quite colorful, with
the sliding bars painted in alternating reds, greens and
yellows. It is similar to the Fowler, except that its
readout is neither on the top nor bottom of the moving
bars, but rather on the side facing the user: the fixed
bars are scooped out at the right hand edge just after
the 9 so that the result can be viewed. Also, instead of
having holes for a stylus, it has raised bumps. Thus only
your fingers are required to operate it. The numbers run
in the opposite direction of the Fowler." Robert K. Otnes |
| Source: Robert K. Otnes, "Sliding Bar Calculators." ETCetera No. 11, June 1990. |
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