Note: This was from an engraver near Sydney, New South Wales. REF Ben Jordan's Scale Of Proportions Slide Ruleīen Jordan's Scale Of Proportions Slide Ruleįor finding the dimensions of an engraving to be made smaller or larger than copy Similar construction to British Unique's but with a different wood Note: CAL is also the initials for Australia's Copyright Agency Ltd. The inner core of the rule is covered with tables of constants, formulae, and conversion factorĪssumed to be Made in Australia - Patent pending 7415/42 It is marked to 4 significant figures at the top end, and can be read to 1 part in 20000. The scale makes 50 turns around the cylinder, for a total length of 413' (34 feet, or 10.5 metres). The single helical scale is marked on a cylinder about 2-3/4' in diameter and 4-1/2' long.

Similar construction to Fuller Cylindrical Slide Rules. F.C.46ĭiameter 3', length 13' closed, 18' maximum Similar construction to 'Electro' model produced by Service Slide Rules.īack: Equivalents, Formulae and Trig identities Made in Australia for Max Wurker Pty Ltd, The W&G is one of ISRM's favorite slide rules, and also the most significant manufacturer in Australia. Normally we try to combine different countries/makes when there are very few of one kind, but Australia'sĮntries in the slide rule market is significant enough to give them their own page, including those from New Zealand.

Renaine mk ii