Autor:	Albert Johannsen, T. C. Phemister
Rok vydání:	1924
Předmět:	Micrometre Optics business.industry Position (vector) Geology business Conoscopic interference pattern Degree (music)
Zdroj:	The Journal of Geology. 32:81-84
ISSN:	1537-5269 0022-1376
Popis:	A method is presented which to a large extent eliminates the errors of observation of the optic axial angle by the Michel-Levy method. Instead of standardizing circles of reference, observations on a mineral of known 2E are made directly through the interference figure of the unknown. The method is accurate to within a degree if the known mineral and the lines on the micrometer ocular are placed exactly in the 45° position.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dac89488f34ba0c5eea0382679997675 https://doi.org/10.1086/623068 Zobrazit plný text záznamu