  This article describes the seven experiments Homestake, Kamiokande, SAGE,
GALLEX, Super-Kamiokande, GNO and SNO which have so far provided data on the
measurement of the solar neutrino fluxes. The detection mechanism, the salient
features of the detectors and the results of each experiment are presented. How
the solar neutrino problem has evolved and became more focused with each
experimental data is summarized. The goals for the future experiments are
outlined.
