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string gnomon: the part of a sundial which casts the shadow, where this part is in the form of a taut string.
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sun and moon dial: sundial that can also tell the time from the shadow cast by the moon, see article on the sundial.
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sundial: instrument of many different forms for finding the time from the position of the sun, usually by measuring the position of a shadow, see article on the sundial.
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sundial and dividers: a compound instrument combining the functions of both a sundial and dividers.
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surveying and gunnery instrument: compound instrument combining functions required in the closely-associated fields of surveying and gunnery, such as measuring bearings and finding ranges.
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