Telescopy :: Telescopy (n.) The art or practice of using or making telescopes.
Telespectroscope :: Telespectroscope (n.) A spectroscope arranged to be attached to a telescope for observation of distant objects, as the sun or stars..
Telestereoscope :: Telestereoscope (n.) A stereoscope adapted to view distant natural objects or landscapes; a telescopic stereoscope.
Thermoscope :: Thermoscope (n.) An instrument for indicating changes of temperature without indicating the degree of heat by which it is affected; especially, an instrument contrived by Count Rumford which, as modified by Professor Leslie, was afterward called the differential thermometer..
Thermoscopic :: Thermoscopic (a.) Of or pertaining to the thermoscope; made by means of the thermoscope; as, thermoscopic observations..