Observation of solar eclipses played an extraordinary role in the development of solar phusics. First of all, this is referred to the studies of the solar colona. Scientific studies of the corona started in the middle of the 19th century, firstly, owing to the appearance of photography and, secondly, the development of spectral analysis methods and the practical application of this methods in observations of solar eclipses. The first photographs (daguerreotypes) of the solar corona were obtained by Bush and Berkovskii during the eclipse of July 28, 1851, in Konigsberg. M. Waldmeir, a classic of eclipse observations, noted that precisely that instant should be considered as the beginning of the era of scientific studies of the solar corona (Waldmeir, 1951). Soon, discoveries poured in as if from the "horn of plenty". Let us briefly list the most important of these.