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- n. Plural form of heliometer.
Sorry, no etymologies found.
The Messrs. Repsold have established, and for the present seem likely to maintain, a practical monopoly in the construction of heliometers.
In 1888-9, at the Cape, he observed the minor planets Iris, Victoria, and Sappho, and secured the co-operation of four other heliometers.
Victoria occupied twenty-one establishments during four months; the direct work of triangulation kept four heliometers in almost exclusive use for the best part of a year; and the ensuing toilsome computations, carried out during three years at the Cape Observatory, filled two bulky tomes  with their details.
Dr. Elkin, of Yale college, co-operated throughout, and the heliometers of Dr.sden,
In these determinations, only heliometers were employed.