1179. na. “Report of the Franklin Institute, on the Dioptric System of Augustin Fresnel for the Illumination of Lighthouses”.
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1179. na. “Report of the Franklin Institute, on the Dioptric System of Augustin Fresnel for the Illumination of Lighthouses”.
1179. na. “Report of the Franklin Institute, on the Dioptric System of Augustin Fresnel for the Illumination of Lighthouses”. 1850. 28 pp. Offprint from the Journal of the Franklin Institute. Quite detailed examination on the relative velue of the present Catoptric System of lights adopted by the United States, compared with the Fresnel Dioptric and Catadioptric System established in the lighthouses in Europe and elsewhere. Early work includes detailed descriptions of Fresnel’s lens apparatus, catoptric and dioptric or lenticular systems, parabolic reflectors and lamps in use, floating lights or lightships, and much more. The journal measures 5 3/4″ x 9” and has some soiling to the title but over all is in very good condition. Disbound from larger volume, pp29- missing. $64.