![]() Standard (not maker’s) symbols for scales on front face e.g. For other calculating aids it is the physical length. For circular/watch slide rules it is the diameter but for helical/tubular/drum slide rules it is the overall scale length. ![]() Mostly the linear length of the D scale (in cm or inches) excluding any extensions. Closed/solid frame or Open frame or Duplex or Otherīasic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. the rest)īasic construction form of the body i.e. L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. Demonstration, Desktop, Pocket, Waistcoat, Lilliput or Book) & when needed, a suffix to distinguish between versions (e.g. Meteorology) for grouping similar models across makers. If not the “standard” 25cm linear length, preceded by the form (i.e. Rietz) or function/use for specialist models (e.g.
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