US Patent: 7,331
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| Board and Log Rule
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Patentee:
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| Benjamin M. Van Der Veer (exact or similar names) - Clyde, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 30, 1850 |
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Ralph Brendler
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Description: |
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This is a pretty cool and gadgety variation on the standard log rule
The rule itself is hollowed out, and a cylindrical member holding a log
table placed inside. One side of the rule has a window cut into it, so
that the table can be seen. Turning the cylinder can show any of a number
of log measures, allowing more than the standard 8 tables to be shown on
a single rule.
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