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So back to the BRH.
In fact I started working on it early last year and then had the project on hold for about a year.
I started by slicing off the corners of the PSK slabs and two other slabs of optical glass, one a barium flint and the other a dense barium crown, to be used as grinding tools. I already had two glass disks that were suitable for making up the 4 grinding discs needed for the PSK lenses. The cutting was done on my milling machine and the mess was confined with the use of an ice cream container. The diamond plated tool used was one that I made many years ago and it still cuts well.
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