DYNAMETERS
Noun
dynameters
plural of dynameter
Source: Wiktionary
DYNAMETER
Dy*nam"e*ter, n. Etym: [Gr. -meter: cf. F. dynamètre. Cf.
Dynamometer.]
1. A dynamometer.
2. (Opt.)
Definition: An instrument for determining the magnifying power of
telescopes, consisting usually of a doubleimage micrometer applied to
the eye end of a telescope for measuring accurately the diameter of
the image of the object glass there formed; which measurement,
compared with the actual diameter of the glass, gives the magnifying
power.
Source: Webster’s Unabridged Dictionary 1913 Edition