Elements of Optical Mineralogy: An Introduction to Microscopic Petrography; With Description of All Minerals Whose Optical Elements Are Known and Tables Arranged for Their Determination Microscopically (Classic Reprint) - Hardcover

Newton Horace Winchell

Hardcover

ISBN 10: 0332375102 ISBN 13: 9780332375106

Publisher: Forgotten Books, 2020

Synopsis

Excerpt from Elements of Optical Mineralogy: An Introduction to Microscopic Petrography; With Description of All Minerals Whose Optical Elements Are Known and Tables Arranged for Their Determination Microscopically

The bertrand lens is a device for magnifying the inter ference figure when it is indistinct, or when it is desired, as in the case of biaxial crystals, to measure the angle of the optic axes (p. Or to make a drawing of it. It is a small lens and serves, with the ocular in position, as an objective of low power to greatly increase the size and distinctness of the interference figure. It is inserted at U, figure 54, the lower end of the main tube of the microscope. It is focused on the interference figure by the rachet at the upper end of the tube. (see also p.

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Edition details

• Publisher: Forgotten Books
• Publication date: 2020
• ISBN 10: 0332375102
• ISBN 13: 9780332375106
• Binding: Hardcover
• Language: English
• Number of pages: 586