LF: Off topic

[Dick Rollema <dickrollema@casema.nl>]

TYo All from PA0SE

I am presently writing an article for our VERON magazine
Electron  on the early radio experiments by Marconi. In these
experiments spark gaps played an important role. Because I would like to
perform some simple calculations on the peak power radiated by a spark
transmitter I am looking for data on the break down voltage of spark
gaps, consisting of two spheres.
In literature, found on the Internet, 75kV/inch is quoted but it is not
stated whether this is between points or spheres and that makes a lot of
difference.
Temperature and air pressure also influence  break down voltage but I
will forget about that, reckoning with "normal"
conditions  of, 
say , 20 degrees centigrade and  1000 hectopascal or whatever as
reckoned as standard  barometric pressure. 
Your help will be very much appreciated.

73, Dick, PA0SE
JN22GD