A collection of WWII Second World War RAF Royal Air Force and Army calculation instruments, to include; an Air Ministry ' Douglas Combined Protractor & Parallel Rule ', still housed in its original cardboard sleeve, a ICAN Aircraft Navigation Computer 6B/250 Mk III, and a 1942 dated ' Clino Mortar Mk IV ' Mortar clinometer in brass.
A collection of WWII Second World War RAF Royal Air Force and Army calculation instruments, to include; an Air Ministry ' Douglas Combined Protractor & Parallel Rule ', still housed in its original cardboard sleeve, a ICAN Aircraft Navigation Computer 6B/250 Mk III, and a 1942 dated ' Clino Mortar Mk IV ' Mortar clinometer in brass.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
