Some of the schematic diagrams of war times radios - though not all of them -
adopt an odd way of identifying resistance values.

For instance a 200.000 ohm resistor is marked "200 Mohm". The "M" means kilo,
not mega! Conversely a 2.000.000 ohm resistor is marked "2 Megaohm".

Does any one know the origin of this way of marking resistors and when it was
abandoned?

73

Tony I0JX
Rome. Italy