Vintage Aircraft Twin Magneto/Accumulator Switch ,Type 49, Air Ministry ,10A/7540

Vintage Aircraft Twin Magneto/Accumulator Switch ,Type 49, Air Ministry ,10A/7540

This is a very unusual Vintage Aircraft Twin Magneto/Accumulator Switch Type 49 Air Ministry 10A/7540. It was used to start a 12 volt, 80 watt, motor generator.

It comprises two brass Dolly Switches on a ceramic base, fitted on to a bakelite and paxolin base which covers the electrical circuits. The main switch comprises a wood/brass handle which connects to both switches so that they can be depressed simultaneously.

The brass dolly switches are marked:-

OFF

START

RUNNING

The back of the bakelite base is marked:-

MG -

MG+

ACC + -

where

MG= Magneto

ACC= Accumulator

The side of the bakelite is marked A.M with the air ministry crown and

SWITCH TYPE 49 

REF No. 10A/7540

where 10A = Misc Radio Equipment

It's a bit of a mystery as to which 1930s aircraft generator the magneto/accumulator switch was used in, and why it is marked 10A for radio equipment.