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Thanks Rod,
I have just built a simple box for both the knife test and the Ronchi screen. Just snapped together with balsa atm, it will look better after it dries and gets a sand. Rubber bands for clamping the front to the back, Coles still had 40w incandescent light bulbs so I'm trying that for a light source. Pretty much a copy of Mr Bartels. If it doesn't work, I can stick a LED and battery pack in there instead.
All I want is to check sphere atm, so, I'm off to make a knife edge shortly. The lateral movement test is next on the list of addons.
Steve
The brush does not get used till the lap is dry and is stored in a "do not touch bag" now.
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