He might want to check with the Royal Navy. They were very interested in determining longitude, and the appearance and disappearance of the moons of Jupiter
Hi, Has your friend contacted the Whipple Museum in Cambridge? They have a collection of slide rules and other calculating devices. Graeme Caudwell's Mill
A friend of mine, Prof. Rod Home, is seeking information about an 18th C special purpose slide rule, as outlined in the following message. Can anyone help? The
Hi All, For those of you who use my search engines etc., at: http://sliderules.lovett.com this is a heads up to say that the site will be down for a major