This arose in Another Place, where only a partial answer was available. I hope you can tell me.
Wiring diagrams in the Haynes Spitfire manual contain variations on a simple symbol, but no translation. The symbol may appear as a diagonally crossed circle, the same with alternate quarters black and white, or a circle half black and white, with the dividing diameter either vertical or horizontal. See below.
A diagonal crossed circle is an alternative symbol for a light bulb, but
This arose in Another Place, where only a partial answer was available. I hope you can tell me.
Wiring diagrams in the Haynes Spitfire manual contain variations on a simple symbol, but no translation. The symbol may appear as a diagonally crossed circle, the same with alternate quarters black and white, or a circle half black and white, with the dividing diameter either vertical or horizontal. See below.
A diagonal crossed circle is an alternative symbol for a light bulb, but