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WWII Albert Nestler Aircraft Tracking Slide Rule - German MilitaryThe one that has been found is at ISRM ( International Slide Rule Museum) . The museum\'s description of this slide ruler is as follows.This 10\" Aircraft Tracking Slide Rule is Made In Germany by Albert Nestler. Labels all in German.
Front Scale:1:3000000km (Flugzeit km proStunde \\\\1:1000000km
Back Side:There is a proof mark with the characters WaA54(Waffenamt Prufstelle) indicating inspection by a German Army Weapons Agency Office, often found stamped on components like the fuse of a hollow-charge grenade (Stielgranate 41) or other ordinance, signifying it passed quality control for German forces , a common inspectors proof mark on various equipment and ammunition during world war II.
Note: This slide rule was used to calculate the speed and direction of flight of allied aircraft bombing formations with the help of a signal box to provide advance warning to intended targets in Germany.
Slide moves smoothly as it should . No breaks Or Cracks. Window is clear on slide rule with no yellow discoloration.See Photos For Proof Mark And Overall Condition.
