How I drew the Nipkow Disk I used Microsoft Excel to calculate x and y coordinates for the holes.
I used Microsoft Excel again to plot an (x,y) graph with as many as possible of the axes, legends and headers etc. removed.
Click here for the .xls file used.
I then exported the (x,y) graph plot into Paint Shop Pro.
This allowed me to trim the shape and size, save it as a GIF for the website, and add the black rim.
The black rim ensures a black background for images seen on the disk, without stray light coming through the paper.
I attempted to ensure accurate printing by making the size of the picture of the disk about the same in pixels as the number of print dots produced by the printer at 300 dpi resolution.
For 8 inch wide A4 paper this is 300 x 8 = 2400 pixels square.