Questar Advertisements
Gregory Gross

Magnificent Performance

First advertisement with an illustration of the full-aperture solar filter.

Full Page Vertical

Questar advertisement, <em>Sky and Telescope</em>, May 1959
Questar advertisement, Sky and Telescope, May 1959. Questar Corporation

Sky and Telescope, May 1959, 392.
Sky and Telescope, June 1959, 460.