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David, Just finished assisting a colleague on a Hamburg B from 1968. It had an action-mounted sostenuto, much to my surprise, as I was unaware they had ever done it this way. In the course of our inquiries ...

I believed it to be in the PDF to which I've linked. I'll try attaching it here. However, having spent rather too much of a day last week searching for the needle in the haystack it's quite possible that ...

The paraffin we get today is a pretty pure substance, seemingly nonreactive. I wonder if what they used then had some impurities. The wiki article on paraffin wax says stearic acid was added to raise the ...