Definify.com
Webster 1913 Edition
Dynameter
1.
A dynamometer.
2.
(Opt.)
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.
Webster 1828 Edition
Dynameter
DYNAM'ETER
,Noun.
An instrument for determining the magnifying power of telescopes.