Descrizione

Boscovich, Ruggero Giuseppe. Milano, Giuseppe Marelli, 1771. Memorie sulli cannocchiali diottrici. In-8°, m. pelle coeva. (8), 9-114, (2 PP. – errata), con una tavola incisa in rame ripiegata f.t. Esemplare ben conservato della rara edizione originale ed unica. Riccardi, I, 182. << John Dollond was apparently the first to try to correct secondary spectrum by the introduction of a third lens in his object-glasses, but he did not publish his result. R. J. Boscovich, a Jesuit professor at the University of Padua, entertained simila ideas and devised an instrument which he called the vitrometrum for investigating residual dispersion… >> (King, History of the telescope, p. 158).