United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 210
d half of Fig. 5)measure the distance of the foreign body above the hori-zontal line and indicate the same on the chart abovethe first dot, as is represented by dot F1 in outlinedrawing Side View. Place another dot on the same horizontal plane atpoint P and draw a line through these two dots,… … Fig. 5. Print of plate, showing construction lines.
