English: Original Caption: Radio set SR-271-D at Evans Signal laboratory show shelter for components and operating personnel, 100 foot tower, and antennae modified for PPI display. IFF antenna is shown top center on radar antenna. *This is the non portable version of the SR-270 which was otherwise identical in capabilities and equipment to the SR-270. *alteration- this version has a border cropped which credits the photo to Lieutenant Zahl. Original at the above location. *This photo is credited to First Lieutenant Harold Zahl, who pioneered Radar use by the Army air corps. The photo appears in a paper by him from the period. *these photos would not have been saved were it not for Dr. Howard W. Andrews, who had the foresight to preserve them along with Lieutenant (Dr.) Zahl's papers for posterity. Credit and thanks to H.W. Andrews for preseving these photos.
Cette image a été retouchée, ce qui signifie qu'elle a été modifiée par ordinateur et est différente de l'image d'origine. Liste des modifications : Calibration. L'image d'origine se trouve ici : SCR-271-D-600.jpg: . Modifications effectuées par Efcuse.
2006-09-08T09:54:33Z Makthorpe 2148x2648 (1180550 Bytes) {{en| Original Caption: Radio set SR-271-D at Evans Signal laboratory show shelter for components and operating personnel, 100 foot tower, and antennae modified for PPI display. IFF antenna is shown top center on radar anten
{{Information |Description={{en| Original Caption: Radio set SR-271-D at Evans Signal laboratory show shelter for components and operating personnel, 100 foot tower, and antennae modified for PPI display. IFF antenna is shown top center on radar antenna.