[ARC5] The BC-221 low frequency tank circuit puzzle.

[Nick England]

M = 1000 in Roman numerals. Mille in Latin.
M or m is still commonly used in commercial pricing for 1000 items.
Bottles $350/M for example. CPM = cost per 1000 ad impressions.

K for 1000 is relatively recent usage I think.

Nick England K4NYW
www.navy-radio.com

On Sun, Feb 14, 2016 at 4:43 PM, <hwhall at compuserve.com> wrote:

> Could this be a French-inflicted unit abbreviation? :-)
> Mille in Fracais is 1000.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: Richard Knoppow <1oldlens1 at ix.netcom.com>
> To: arc5 <arc5 at mailman.qth.net>
> Sent: Sun, Feb 14, 2016 12:38 pm
> Subject: Re: [ARC5] The BC-221 low frequency tank circuit puzzle.
>
>    Didn't see this when I posted, I was referring to the same thing.
>
> On 2/14/2016 7:57 AM, Glen Zook via ARC5 wrote:
>
> When looking at schematics from the 1930s and even into the 1940s, for
> some reason, where the values of especially resistors are concerned, a
> number of manufacturers used an "m" instead of a "k" to indicate a
> multiplier of 1000.
>
>
>
> The first time this happened to me, I started scratching my head trying to
> figure out why all the very high value resistors.  Then, I realized that
> the "m" was used instead of a "k".
>
>
>
> Glen, K9STH
>
>
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