A New Method of Making Accurate Spectrograph Slits by Photographic Methods
Abstract
A new method of making spectrograph slits by photography has been developed, in which the properties of a photographic plate (Kodak Type 649) with great resolution and high contrast are utilized to produce microscopically sharp and contrasty edges. Three methods are described; the first by contact printing, the second by shadow printing, and the third by spotlight-exposing followed by contact printing. The new slit has many advantages over the conventional metal slit. It costs much less to make, and is more uniform in width than any simply-made metal slit. Spectra of the solar corona have been obtained with a curved photographic slit, and are found to be comparable in quality with those taken with the old metal slit.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 1951
- Accession Number
- AD0740706
Entities
People
- Ch'ing-sung Yue
Organizations
- High Altitude Observatory