Papers On the Comparative Merits of the Catoptric And Dioptric Or Catadioptric S
Papers On the Comparative Merits of the Catoptric And Dioptric Or Catadioptric S
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Letter from W. C. Wilkins, Esq.
LONDON, July IS, 1850.
SIR: In answer to your letter of 29th of May, requesting informa- tion concerning improvements in light-houses and light-vessels, I beg herewith to enclose a book which I have recently published contain- ing drawings and particulars of the various catadioptric light appaj ratus on Fresnel's system, used in this country, including two appa ratus for which I have obtained letters patent in connection with M. Letourneau, of Paris; one is a rev...olving light, short eclipses produced by a new arrangement of the lenses, of the central part and additional vertical prisms, gathering the rays from the upper and lower catadi- optric portions, giving a great increase of light, and is what I am now exhibiting in the great crystal palace, Hyde Park; the other is a reciprocating apparatus, with additional vertical prisms before mentioned, and reduce the cost of flashing light when it is not required to be seen beyond the same circle, or half the horizon.
What to read after Papers On the Comparative Merits of the Catoptric And Dioptric Or Catadioptric S?
You can find similar books in the "Read Also" column, or choose other free books by United States Light House Board to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Letter from W. C. Wilkins, Esq.
LONDON, July IS, 1850.
SIR: In answer to your letter of 29th of May, requesting informa- tion concerning improvements in light-houses and light-vessels, I beg herewith to enclose a book which I have recently published contain- ing drawings and particulars of the various catadioptric light appaj ratus on Fresnel's system, used in this country, including two appa ratus for which I have obtained letters patent in connection with M. Letourneau, of Paris; one is a rev...olving light, short eclipses produced by a new arrangement of the lenses, of the central part and additional vertical prisms, gathering the rays from the upper and lower catadi- optric portions, giving a great increase of light, and is what I am now exhibiting in the great crystal palace, Hyde Park; the other is a reciprocating apparatus, with additional vertical prisms before mentioned, and reduce the cost of flashing light when it is not required to be seen beyond the same circle, or half the horizon.
What to read after Papers On the Comparative Merits of the Catoptric And Dioptric Or Catadioptric S?
You can find similar books in the "Read Also" column, or choose other free books by United States Light House Board to read onlineMoreLess
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