the Museum. The International Slide Rule Museum is said to be "[the world's] most extensive resource for all things concerning slide rules and logarithmic calculators". The museum's Web page includes literature relative to slide rules on its "Slide Rule Library" section. See also Abacus Flight computer Floating point Hans Peter Luhn, inventor of the Lunometer, a thread-counting gauge Nomogram Sector (instrument) Slide chart Timeline of computing Vernier scale Volvelle Notes External links General information, history International Slide Rule Museum The history, theory and use of the engineering slide rule — By Dr James B. Calvert, University of Denver United Kingdom Slide Rule Circle Home Page Oughtred Society Slide Rule Home Page — Dedicated to the preservation and history of slide rules Rod Lovett's Slide Rules – Comprehensive Aristo site with many search facilities Derek's virtual slide rule gallery — Javascript simulations of historical slide rules Reglas de Cálculo — A very big Faber Castell collection Collection of slide rules — French Slide Rules (Graphoplex, Tavernier-Gravet and others) Eric's Slide Rule Site — History and use Slide Rules — Information from The Museum of HP Calculators Descriptions, alphabetical by brandname, with images (Vintage Tech. Assoc.) Analog computers English inventions Historical scientific instruments Logarithms Mechanical calculators 1620 introductions 1622 introductions 17th-century inventions