> Not where I've looked. =A0Sometimes inductors are drawn with a bunch of t=
op
> half of circles stuck together. I think that's good enough, but I like to
> take a little extra care and show the loops.  Put it this way, which is m=
ore
> likely to be confused, a loopy inductor or a filled box?  I would find it
> hard to believe that the loopy version would be ambiguous to anyone aroun=
d
> the world who has at least a cursory knowledge of schematics, whereas I
> wouldn't say the same for the filled box.  Where's the upside?

That was standard coil symbol in eastern block, at least in USSR. It
could even have a single thick solid line along those half-circles if
that coil had iron-based core, and dashed thick line if it had
ferrite-based core. Most probably there were other options too.
That symbol was very easy to draw using hand drawing tools.

Resistors were drawn as empty rectangles, and even there it was
possible to give more information - empty rectangle usually was
meaning 0.125W, one diagonal line was 0.25W, one line perpendiculat to
length meant 0.5w, and so on.

So there are lots of engineers all over the world now, coming from
there, who have to think twice when reading circuits that contain
rectangles :)

>
> The point of many electrical symbols is that they are intended to be quic=
k
> visual reminders of what the part does. =A0In that context resistors as
> zigzags, capacitors are two parallel lines, and inductors as loops make a
> lot of sense. =A0The symbols for vacuum tubes, diodes, and even transisto=
rs
> were clearly designed with this concept in mind too. =A0It gets more
> complicated for intgrated circuits, so you usually give up and draw a box
> and label the lines.




As a side note, ex-USSR standard for drawing digital circuits was
quite good either, it was much easier to understand from the first
look, not like many of the versions we see now.


--=20
KPL
P.S. Just do not think I liked USSR itself:)

--=20
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