Non-standard rules The rules in this section are all rather special. Although capable of a range of calculations they have their own way of doing it.
Fowler "long scale" (Instructions available)	"Pocket watch" type circular rule.	Original instructions.
Otis King (Instructions available)	Cylindrical rule	Original instructions.
F B Cox folding slide rule	Two foot, two fold rule, (Coggeshall rule). Also rules by Aston and Higgison.
Buck and Hickman timber rule	A Coggeshall type rule
Lorkin	Ship's mast design
Roberts	Everards type rule
Unnamed	A tin-plate rule	Instructions.
Sector	A forerunner of the slide rule.	Full instructions.
Hemmi No 32	A 4" rule with a magnifying cursor
Tavernier-Gravet	An early French rule with metal cursor
Tavernier-Gravet	This rule is even earlier than the one above and has double-length scales.
Kern	Stadia rule	Instruction for stadia scales.
Cardboard rule	No maker given
Computing Scale	Aaron Palmer
Calculigraph	An early French "pocket watch" type rule.
Routledge Engineer's Rule	An early type of 2-foot 2-fold rule.
Unknown maker	Timber rule
Unkown maker	Russian circular rule	Basic instructions
Ivory Soho rule	Bryan, Manchester
Boxwood Soho rule	Elliot, London
Multi-purpose 4-faced rule	Unnamed
Unknown manufacturer	Gunter scale
Slide rule plate	Not a slide rule but a picture of one
Simple rule patented by Dr Seehase	An advertising rule made of cardboard and plastic.

Notes:
Original instructions =  scanned version of maker's original instructions
Full instructions =  complete instructions based on book or similar.
Instructions = instructions based on my own research.
For some rules instructions are given for special scales only.