Scale RulesPromotional Rules
Since people frequently needed length measures for everyday activities, American companies realized in the late 19th century that rulers could be effective giveaways for promoting their businesses. Some of these were based on a design patented by Henry Adler, an inventor who manufactured iron and sheet metal products in Pittsburgh, so this page also includes three of the four patent models for scale rules found in the mathematics collections. (The fourth is shown on the page for triangular rules.) Since the promotional rules and patent models were often combination instruments—putting length measures together with paper cutters, protractors, and the like—these objects are included in this category.
"Scale Rules - Promotional Rules" showing 1 items.
- This wooden ruler is divided to 1/16" and numbered by ones from 1 to 14. Below the scale is a summary of Minnesota fish laws for 1940, listing the number of fish that could be caught in a day and held in one's possession for 20 different species. The seasons for catching different fish are also provided. A hole at the right end of the rule allows it to hang from a hook.
- The back of the rule is marked: For Better, Faster Shaving – (/) USE BERCO BLADES. It is also marked: BERCO (/) DOUBLE EDGE and SINGLE EDGE (/) BLADES. It is also marked: Fit Your Face For The Outdoor – (/) USE BERCO BLADES. Berco distributed electric shavers and razor blades from Toledo, Ohio.
- Reference: "Razors, Blades, Sharpening," Popular Mechanics 103, no. 4 (April 1955): 69.
- Currently not on view
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- Data Source
- National Museum of American History, Kenneth E. Behring Center