National Geographic : 1962 Apr
O1TOGRAPHER ROBERTB. GOODMAN; HS EKTACHROME BY DAVID G. ALLEN (LOWER RIGHT) C N.G.S. Recording bird songs, Dr. Allen holds a 30-inch parabolic reflector that has the effect of bringing a songster thirty times closer. Wired micro phone, which feeds sound into the tape recorder on the ground, receives 900 times more energy than it would without the re flector. David Allen (with earphones) monitors a call and tells his father where to aim. Bird-song records at lower left help support the laboratory. Fifteen long-playing discs are available. Some buyers use them to attract birds to windows. "Don't wait until spring for the birds to sing," says the author; "get a record now." Dr. Peter Paul Kellogg, the assistant director of the laboratory in charge of sound recording, ex plains to Lewis Pearsall, an assistant, the use of an oscilloscope in studying recordings of bird songs.