Pickett & Eckel Model N-520-T
U.S. Air Force Aerial Photo
Slide Rule Type A-1
(ca. 1954-57)
slide rule
Click to view 300 dpi image.
 
slide rule
Click to view 300 dpi image.
ManufacturerPickett & Eckel
ModelN-520 U.S. Air Force Aerial Photo Slide Rule Type A-1
Serial No.
Scale length25 cm
Overall length30.8 cm
Width3.8 cm
Body/Slide materialsAluminum, 2.5 mm
Post materialsStamped aluminum
Cursor materialsMachined aluminum (extended) / Plastic (plain, flat)
Scales {L A} DF [CF CIF {T S} C] D {DI K}
special [special] special
AccessoriesBrown leather case labeled "U.S. Air Force Aerial Photo Slide Rule Type A-1", good condition, include pocket for plastic card with conversion settings.
Notes Owner added gauge mark "C" at ~1.127
M 520-700 How to Use the U.S. Air Force Aerial Photo Slide Rule, .pdf (8.9 MB)
Tag No.PE-520
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