Decimal Equivalents

[As seen on the second floor of the Main Laboratory at the Thomas Edison National Historical Park, West Orange, New Jersey. Photograph by me. Click for a much larger view.]

Impossible to know if that chart is an original from Edison days, but it does have a 1908 copyright. The sign in the background is attached to a precarious-looking elevator. There too, it’s impossible to know if the sign from Edison days. The elevator, however, is no reproduction.

[Having longed for Aaron Draplin’s “Handheld Decimal Equivalent Chart,” an item for which, I admit, I have no earthly need, I had to photograph this sign.]