magnetic drums

[William Donzelli]

>  They also used a drum, and the article described how they coated the drum
> with the mixture of oxide and -something- with a normal painter brush, by
> hand...
>  That -something- is mentioned in the article, I forgot what it was.

Yes, that -something-. That is what is the mystery.

The binder for a marine grade paint would probably work fine.

>  Distance between heads and drum was measured using cigarette paper as a
> shim....

Or those squishy plastic thread gauges that machinists and engine
rebuilders use.

--
Will