water telescope
Noun
Meaning
A telescope in which the medium between the objective and the eyepiece is water instead of air, used in some experiments involving aberration.
A telescope devised for looking into a body of water.
Source: en.wiktionary.orgExamples
Aether drag models seeAlso Fresnel's aether drag In 1818, Augustin Fresnel developed a modified explanation to account for the water telescope and for other aberration phenomena.
Bradley's explanation cannot account for situations such as the water telescope, nor for many other optical effects (such as interference) that might occur within the telescope.