Homebrew PCBs

Dave,
     When a building is struck by lightning, long runs of wires in 
the building like Alarms and Computer networks, receive an induced 
high voltage. Some circuits use a spark gap.  The gap can be a simple 
gap to ground or a solid state device. The old devices looked like 
tubes. My guess is the are spark gaps....then again they could be 
test points.
                                                  John  



--- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" <dave_mucha@y...> 
wrote:
> Hi all,
> 
> I have been looking at some board from some other stuff, laser jets 
> I've pulled apart and alarm panels and stuff, and I have seen more 
> than a few sections near terminal connections that look like 
> triangles in a row, and a mirror image so the very tips of the 
> triangles seem to touch.
> 
> any idea why ?
> and is one does them (for the reason in the response) is there a 
real 
> need for them ?
> 
> Dave