US Patent: 46,348
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| Improvement in Parallel Rules
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Patentee:
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| E. C. Gillette (exact or similar names) - Richfield, BC Canada |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 14, 1865 |
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Ralph Brendler
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Description: |
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This is perhaps the most complicated parallel ruler ever invented. It
features a rack and pinion adjustment that drives a worm gear driving
a second pair of racks, each attached to a scissor joint connecting the
two rules.
The inventor claims this tool to be more accurate and less likely to
get out of alignment. but I think these benefits would be dwarfed by
the fragility of the mechanism.
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