If it is 90:1 the division charts for the Vertex HV6 will probably be useful. But unless recent, they do contain errors and omissions. Corrected charts are available on here. Ask Neil how to access them.
Hi John, whilst the makers name may be interesting, if you want to use it, it is simple to find out the ratio and then any good engineering hand book will give you the charts. If You want to know more come back to me. I will get a book out. Noel
Hi John, I have one that looks very much the same, apart from being a bit rusty, that is. Mine has the name of Fred C Dickow, Chicago ILL. with the number 1092
Hope this helps.
Regards Nick.
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