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I was very sorry to hear about Hanno,

I never met him personally, but we had a friendly and very interesting email correspondence in recent years.

He helped me a lot with the maths and also useful advice on engineering homemade instruments like slide rules.

In fact, he was so helpful, I sent him one of my homemade Fuller 2 cylindrical slide rules a few months ago. I hope he had some fun with it. 

He told me a bit about his recent trip to New Zealand which apparently had  been a long term ambition, so I am glad he did that. (It is still on my bucket list)

I hope we can keep his correspondance on line? I would cetainly like to refer to some of his earlier posts.

Best wishes

Francis Upchurch