A slide rule is an instrument which is used to carry out mathematical calculations. William Oughtred is credited with its invention in 1621, however many others including Isaac Newton have made improvements or modifications over the years. From 1625 to 1800 there were approximately 40 different styles brought forward. with the following 100 years sees over 250 designs created.There have been different versions and modifications to suit scientific, mathematical and engineering requirements. It is interesting to note that many of the buildings of the 19th and 20th centuries have been designed with the use of slide rules. Their use has declined in the last 25-30 years with the advent of computers and specialist calculators.While not directly linked in any way to the history of Warrnambool, this slide rule would have been a item in use by students doing maths at upper secondary level as well as other applications which would make it a familiar object to many people.Coated bamboo with sliding metal framed glass panel or cursor . The bamboo is in three sections with the middle section movable. It is marked in various graduated measurements mainly in dark blue but with some in green and red.It is inside a dark grey rectangular box with a slide off lid on one end.There is a celluloid panel on the back with a conversion table printed on it. There is an accompanying 67 page manual with a pale green cover with black text. On slide rule:Sun Hemmi Japan No 2664S On box: Sun Hemmi Japan No 2664S warrnambool, hemmi slide rule, bamboo slide rule

One bamboo slide rule made by Faber Castell and case made of green and clear plastic. Item belong to CPL Andrew Gizycki and marked with brown tape with white type. Empty blue casing "Sun Hemmi Bamboo Slide Rule"37505 Cpl Andrew Gizycki. Radio Mech RAEME 7 RARslide rule, 7 rar, andrew gizycki