Studies of Obsidian as a Material for use in Making Astronomical Mirrors
Abstract
During this period no further samples of obsidian have been collected in the field. the principal effort has been concentrated on grinding and accurately figuring mirrors for testing, including one from the largest single piece of obsidian that is available, so that the performance of the material under normal operating conditions in a telescope can be evaluated. Measurements of the thermal properties of obsidian have been made, and measurements of other physical properties are being completed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1955
- Accession Number
- AD0740689
Entities
People
- Theodore Dunham Jr.