US Patent: 2,791,836
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| Instrument for measuring the slope of a curve at a selected point thereon
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Patentee:
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| Heinz Joseph Gerber (exact or similar names) - Hartford, CT |
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Patent Dates:
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| Applied: |
Dec. 21, 1955 |
| Granted: |
May 14, 1957 |
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Jeff Joslin
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Description: |
| This device measures the slope of a tangent to a curve, which is a type of "goniometer", a slope-measuring device. This is the "Gerber Derivimeter" which provides a rotating tangent line and a perpendicular pointer that references a semi-circular scale from which the slope is read. Fine-adjustment knobs are provided. A competing design, the German-made "Ott Derivimeter"(labeled "A. Ott / Kempten / Bayern") used mirrors to ease the process of finding the correct tangent. Thus far we have not found a patent for the Ott Derivimeter. The Ott design was simpler and more robust, and came with a sturdy wooden case in contrast to the stitched cardboard case of the Gerber. Both the Gerber and the Ott are quite rare. Videos of each can be found on YouTube. |
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