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There is an enormous amount of information out there on the web. I have listed here a few of the sites that I have found most useful.

I am always interested in learning more about the items in my collection and welcome further information. Perhaps you have something you think I might like to add to my collection. I can be contacted by email by following these instructions. My email address consists of three parts:
(1) My user name which is Weymouthdavid
(2) The usual symbol
(3) yahoodotcodotuk
Putting these three parts together with full stops in place of dot will give you my email address which hopefully won’t be found by automatic spammers. Any spamming will result in this facility being closed. I do not open spam messages.
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Drawing Instruments

Slide Rules
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