United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 253
Fig. 1. Radiograph made at distance of 72 inches.of heart in relationship to the interior chest wall. Correct size … Fig. 2. Outline drawing traced from the long distanceradiograph supplemented by stereoscopic examination. Theposition of each valve, except the aortic is indicated by itsinitial letter. The aortic orifice Is indicated by the begin-ning of the aorta. 246
