“…We had several aims in view: e.g., automated photometric classification of a wide variety of stars (Smriglio et al 1986(Smriglio et al , 1988(Smriglio et al , 1990, CCD photometry in the Vilnius photometric system (Boyle et al 1990a,b;Boyle et al 1994;Dodd et al 1996;Boyle et al 1998;Smriglio et al 1998;Smriglio et al 2002), determination of interstellar extinction (Smriglio et al 1991;Boyle et al 1992;Janulis & Smriglio 1992), and the study of the cloudy structure of interstellar dust and the gas-to-dust ratio Smriglio et al 1995;Smriglio et al 1996). The observations of globular clusters give the opportunity of calibrating photometric systems in terms of temperature, luminosity, and metallicity, since these parameters, and the interstellar reddening of the cluster stars can be measured with rather good accuracy.…”