The time evolution of these two lines was simultaneously recorded using a combination of a spectroscope and a streak camera.
But an infrared bolometer, if available and not too expensive, would give a more reliable diagnosis of reflectors as living or non-living than an optical spectroscope.
The spectroscope in physics and chemistry is what the microscope is to biology.
They put in such minute quantities that it cannot be seen except under the spectroscope, but it is nevertheless sufficiently present to prevent effective testing by heat.
A spectroscopic binary is called double-lined when the absorption lines of both stars can be observed with a spectroscope.
There he also kept an astronomical regulator, heliostat, spectroscope, diffraction gratings, microscope with micrometer, balance, thermometers and barometers.
As well as his telescope, he also went equipped with a spectroscope, to study the spectral lines of the light emitted from the sun.
Analysis of this light, with the help of a spectroscope gives us a discontinuous spectrum.
