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12598 documents, page 1 of 1260

Aragón : revista gráfica de cultura aragonesa: Año VI Número 52 - 1930 Enero

Anonymous (1930)
Copia digital. Zaragoza : Gobierno de Aragón. Departamento de Educación, Cultura y Deportes, 2012

Black bodies in the extreme infra-red

Cartwright, C. Hawley (1930)
Absorbing power of various materials of wave-lengths greater than 50μ—For blackening a receiver of a thermocouple for radiation for obtaining pure rotation band spectra, it is desirable to use a material that is an efficient absorber of the extreme infra-red but a poor absorber of radiation of shorter wave-lengths. The absorbing power of 25 materials were tested for radiation of wave-lengths near 4μ and greater than 50μ. Of all the materials tested, white lead, litharge, red phosphorus, powde...

A series of rational surfaces

Williams, A. R. (1930)