Lit. Fraunfelder, Palermo.
The panel, originally in black and white, was colored by hand by Giuseppe Lorenzoni who used it for a number of theoretical studies on solar protuberances and their observability. The efforts on this study lasted several months that finally led Lorenzoni to envision a mathematical and observational procedure to make it easier and quicker the operation to put in focus the spectroscopic line which was going to be observed at any given time. From this study it became clear that, in astrophysical observations the telescope and spectroscope depended strictly from one another and therefore they had to be adapted to the observational needs of each other. So he coined the name telespectroscope.