Hi Richard:
Just a guess:
Something like the Indexing Spin Jig would be used to position a
blank disk where the smallest step corresponded with a dot.
https://www.prc68.com/I/DrillPress.shtml#SI
This one makes one degree steps.
Also see the Vernier Scale sub section:
https://prc68.com/I/UkiahObs.shtml#Dividing_Engines
A small saw blade whose width corresponds with a dot is used to cur
or not cut the disk.
Once you have a disk a different machine could be used to make a
copy in much less time that the making the master disk.
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
This is a better site than the ones I found for Omnigraph. They
were widely advertised as learning tools. Probably easy to adapt
it to keying a beacon. It does appear from the pictures that its
an Omnigraph disc. Now, how did they make it?
On 8/24/2024 10:45 AM, Brooke Clarke via ARC5 wrote:
Hi Bill:
I looks like an Omnigraph disk.
https://prc68.com/I/Omnigraph.shtml
<https://prc68.com/I/Omnigraph.shtml>
--
Have Fun,
Brooke Clarke, N6GCE
https://www.PRC68.com
axioms: