Please contact the contributing institution for more information regarding the copyright status of this object.
Kolster Radio Compass, with unidentified man demonstrating, in photograph and drawing to imply a ship at sea. Two copies (one copy on white scrapbook paper, with Doug Perham typed caption: Kolster Radio Compass.) Featured on page 66 of Electronics in the West with this caption: "Frederick Kolster's direction finder, or radio compass. Location was determined by rotating the loop antenna."
Federal Telegraph Company Kolster Radio Compass Kolster, Frederick A