Current Flowing Indicator.

[pwdrive]

"Idea: since very early wireless sets used wire-wound resistors, was the symbol [lower case omega] used to denote a wire-wound 'resistance' - as they were then called - as opposed to a carbon type - or perhaps vice-versa ?"

Hi Al, that might make sense as the humdinger resistors shown in the 3rd diagram would definately be w.w. jobs.

Lawrence.