[ARC5] Hallicrafters S-38 - ground symbols

[Richard Knoppow]

    The only place I ever saw the fork symbol widely used was in ARRL 
diagrams.  The fellow who did their drafting for decades seems to have 
liked it.  Actually, either symbol is OK since the rules are pretty 
loose but the triangular symbol is more common. Where both are used the 
triangle is usually a common that is isolated from the chassis except 
perhaps at one point where the fork symbol nearly always means the 
chassis or a ground to earth. In "Reference Data for Radio Engineers" 
4th edition (available on the web) the symbols are defined as follows: 
the fork symbol is called "chassis" and the triangle is called "ground". 
I think Hallicrafters follows these definitions.  Schematic symbols vary 
all over the place; its possible to find fairly late drawings, 
especially in patent literature, where tube grids are shown with 
triangular lines or even square wave lines, holdovers from the very 
early days.  There is also the confusing practice of labeling resistors 
and capacitors with m meaning thousand rather than million. So, the 
cynic says "nothing is ever what it seems" but what does the cynic do 
when something turns out to be exactly what it seems?

On 11/17/2015 2:53 PM, hwhall at compuserve.com wrote:
> Well, I dunno about that: I have always
> viewed the "fork" symbol as meaning
> a direct-connection to a metal chassis, or
> to a sort of electrical "sink", or
> common, and the conical-looking one as a
> connection to the earth, the
> dashed-lines representing something buried
> underground.
> I think that's the way I was first shown it, Ken, but after lots of exposure to ARRL pubs & some others I came to accept the conical looking one as a local common (that may or may not also be connected to an earth ground) unless otherwise indicated in the diagrams.
>
> Wayne
> WB4OGM
>
>   
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL