Specialised rules These rules are designed to perform one relatively straightforward task, as opposed to rules which were capable of a wide range of calculations.
Concrete volumes	Full instructions on slider!
T G Buss	Excise (alcohol) rule	Full instructions
Dring and Fage	Proof rule
Dring and Fage	Ullaging rule	44" long.
J Long	Proof rule
Dring and Fage	Excise rule with gauging rods.
Dring and Fage	Gauging rule.
Unknown	Gauging rule (probably very early)
Unknown	Sea navigation rule
Double sharp weight calculator - Model A	A rule for calculating weights of steel
EASYR Hydraulic Slide Rule	Velocities in pipes	Instructions
KENT hydraulic rule	Similar functionality to above rule plus hand made adaptations.
Honeysett hydraulic rule	Calculation of flow in sewers
Vickers-Spearing Boiler Co. Ltd.	Calculations of boiler efficiency	Instructions
Concrete mix calculator	Classed as a sliding table
Globetrotter mileage calculator	Also a sliding table.
Globe Tank & Foundry	Tank volumes
Blundell Harling F5100	Black body radiation rule,	Summary instructions given.
Thornton No 241	Artillery rule	Summary instructions given.
Aerial Navigation Slide Rule CPU 26A/P	For calculating drift, altitude correction etc.
American Blueprint Co.	Military rule for ranging calculations.	Instructions for range calculation scales and description of "mils" as angular unit.
Jeppesen CSG-2P	An aerial navigation rule with explanation of use	Instructions
Tarrant hydraulic rule	Made by BRL for pipe and channel flow.	Original instructions
Mear	Water flow calculator	Extended summary of instructions
Mear	Probability & quality control calculator
Mear	Pipe flow calculator
Mear	Gas flow calculator
Mear	Nozzle and orifice flow
Mear	Streamline flow
Mear	Brick, blockwork and concrete calculator	Instuctions on rule
Mear	Steel coil weight calculator
Pickett	Spring calculator	Original instructions
Pickett	Business and finance rule - with special mark-up and discount scales.	Instructions for "cost mark-up" and "retail mark-up" scales.
Vickers	Machine gun slide rule	Instructions
Cox and Stevens	C-130A load adjuster
Aristo	Reinforced concrete (Stahlbeton)	Extended summary of instructions
Nestler	0438 System Jakob (Reinforced concrete)
Graphoplex	STATOS Stahlbeton (Reinforced concrete)
BRL	Nuclear effects calculator
Wilkinson (Unique)	Sugar rule	Conversion of sugar prices.
IWA	IWA-Tronic 0272	Made of layers of plastic.
Europcar	Fuel economy calculator	Provided free by car rental company.
Stack-loss	Boiler efficiency	Made for a major UK fuel producer.
Hemmi	Electrical rule	Copy of Faber rule
Hicks	Pilot balloon slide rule
Horse-power computer	Paramount	Designed by a drag-racing enthusiast.
Pilot's key ring	APR	APR also make flight computers.
Chesterman	Cattle gauge rules	Instructions on rule
James Noble	Improved Engineer's rule

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.