I only found some badly translated Italian page that doesn't get me any wiser.
Can someone explain it to me?
http://www.microscopeitaly.it/2010/09/1 ... scrizione/
This is the model I have. (not my picture)This engine, by a mechanism, move one of the two frosted glass (rear one) to oscillatory so that the texture of the grinding (though thin) is totally invisible, which makes it possible to observe even the most minute details of the sample.