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Some of the last people using them for work may have been graphic artists, who called them "proportion wheels". I don't know how many of the folks sizing photos
by cafard 8y ago
Some of the last people using them for work may have been graphic artists, who called them "proportion wheels". I don't know how many of the folks sizing photos knew that they were using circular slide rules.
- ghaff 8y agoAt one time there were a lot of industry specific tools to calculate various things (usually made out of cardboard) that were effectively slide rules or slide rules combined with lookup tables.