Dynameter
Encyclopedia
A dynameter is an instrument that measures the magnification
of a telescope
. It is usually a double-image micrometer
used to measure the diameter of the image of the object glass. The magnifying power is found by comparing the actual diameter of the image on the glass with the measured image diameter.
Magnification
Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called "magnification"...
of a telescope
Telescope
A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation . The first known practical telescopes were invented in the Netherlands at the beginning of the 1600s , using glass lenses...
. It is usually a double-image micrometer
Micrometer
A micrometer , sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier,...
used to measure the diameter of the image of the object glass. The magnifying power is found by comparing the actual diameter of the image on the glass with the measured image diameter.