National Geographic : 1962 May
HS EKTACHROME(ABOVE) AND KODACHROMEBY NATIONALGEOGRAPHIC HNUIUOKArHLUI' IMCautn ) A .".J. Bubble of fabric, supported by air pressure, protects the world's biggest horn antenna at Andover, near Rumford, Maine. American Telephone and Telegraph Company built the 340-ton trumpet to converse with Telstar and Relay satellites. Seen under a full moon, the 160-foot-high dome shields the horn during construction. A rubberized Dacron cover has since replaced the temporary nylon shown here. Time exposure makes the 650 stars in this photograph appear as diagonal streaks of light. Model horn engrosses Eugene F. O'Neill (left), Telstar project director for Bell Laboratories, and Burdick W. Pierce, an A.T.&T.senioren gineer. The model's dome, unlike the actual one, is transparent. Dome prevents warp ing by wind and weath er, which would distort the horn's tracking eye. Turning with ballet dancer grace, the huge horn has an error mar gin of less than 1/20 of a degree of arc. It rests on a mass of concrete 4,000 cubic yards.