Artillery Slide Rule A.G. Thornton R.A. 10 (0688)

May 15

Index: 0688

Year: Around 1950 ?

Maker: A.G. Thornton, Manchester

Dimensions: 32 x 5 x 2.5 cm

Info

Slide Rule Thornton R.A. 10 P.C.7.A.X. Mahogany with celluloid. Aluminium slider frame. I understand that most of these came with 2 sliders for the British version. This is a metric version. If these also came with 2 cursors, then one is missing here. It is unclear if the original 2 cursors were in case one is lost, or had use.

On the backside "notes", one can see the inscriptions B.H.Q/0,3 and ZRHA. Department or unit?