Original British Victorian Navy Parallel Ruler for Charts by Army & Navy C.S.L. in Wooden Case c. 1870 Royal Air Force It looks to be made

It looks to be made mostly of what appears to be aluminum

Recently acquired at a military show

the Pilot of this B-17 Flying Fortress makes a forced landing in the safety of an English cornfield

which may indicate the type of officer it was issued to

but this example was never personalized in that fashion

Original British Victorian Navy Parallel Ruler for Charts by Army & Navy C.S.L. in Wooden Case c. 1870 Royal Air Force It looks to be madeOriginal Item: Only One Available. Here we have a very nice British Victorian Era Parallel ruler, as used by the Royal Navy. The ruler measures 18 1 4" x 2 1 2" and is relatively heavy, being made entirely of brass, and is intended for use on Naval Charts. It has two linked roller "wheels" built into it, so that it can be easily moved parallel to its previous position, a very useful feature when dealing with maps. The ruler is in very good condition,