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plural sundials
A device measuring the time of day by the position of a shadow cast by a pole or plate (gnomon) upon an engraved series of marks. quotations examples
Elbows almost touching they leaned at ease, idly reading the almost obliterated lines engraved there."I never understood it," she observed, lightly scornful. "What occult meaning has a sun-dial for the spooney? I'm sure I don't want to read riddles in a strange gentleman's optics."
1907 August, Robert W[illiam] Chambers, chapter VIII, in The Younger Set, New York, N.Y.: D. Appleton & Company