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175 to 179 of 227 glossary terms
rule (or ruler): an instrument of multifarious functions in the form of a straight rod of metal, wood or other material; a folding rule is an alternative form with two or more jointed legs.
Saints' days: anniversary days for Christian saints.
scaphe dial: sundial where the hour lines are marked on a concave hemisphere or part hemisphere.
sector: calculating instrument using pairs of lines on the faces of two hinged arms, see article on the sector.
sexagenarium: an instrument in the form of a volvelle for planetary calculations.
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