Fearn's Colliery Ventilation Officer's Calculator 

Mear's Converion Calculator 

Fearn's International Unit Converions Calculator 

Mear's Combustion Efficiency Calculator 

Fearn's Conveyor Belt Calculator 

Fearn's Conveyor Belt Calculator, Metric Version 

Fearn's Cyclone Soundrater for Centrifugal Fans 

Mear's Domestic Central Heating Calculator Imperial 

Mear's Domestic Central Heating Calculator Imperial for Houses and Bungalows, Model N0.8. 

Mear's Industrial Central Heating Calculator, Model No.3. 

Fearn's Mear Heating Engineer's Calculator 

Mear's Ducting Calculator Imperial 

Mear's Electric Lighting Calculator 

Fearns, Mear and Company, Fawcett Extrusion Calculator 

Mear's Gas Flow Calculator Metric Model GPMS 

Mear's Gas Flow Calculator Imperial Model G4 

Fearn's Gear Rating Computer 

Mear's Glare Index Calculator 

Mear's Helical Spring Calculator 

Fearns Inches to Millimetres Conversion Calculator 

Mears Inches to Millimetres Conversion Calculator 

Fearn's Inertia Calulator for Rotating Masses Metric 

Fearn and Mear's Machining Time Calculator for Lathework 

Mear's Pipe Flow Calculator for Liquids and Gases (Turbulent Flow) Model No.3 

Fearns Evershed Powerotor Power Calculator. 

Fearn's Presswork Calculator, Model P.42. 

Fearn's Production Engineer's Calculator, Metric Model P.30.M. For Machine H.P., Batch and Production Times, Speeds, Feeds and Cutting Times 

Mear's Psychrometric Calculator for Air Coditioning and Meteorology 

Fearn's ReOrder Point Calculator, Model A61 

Fearn's Shaft Size and Horsepower Calculator 

Fearn's Slide Rule 

Fearn's Open University Slide Rule for course TM281. 

Mear's Steam Flow Calculator for Flow at Pressure or Vacuum. 

Fearn's Tank Capacity Calculator 

Fearn's Typographer's Calculator 

Mear's Valve Sizing Calculator for Hydraulic Pressing Operations 

Fearn's VeeBelt Horsepower Calculator 

Mear's Warm Air Heating Calculator for Domestic Installations 

Mear's Weight Calculator for Rolled Steel Sections (Imperial) 

Mear's Weight Calculator for Rolled Steel Sections (Metric) 

Mear's Weight Calculator for Rolled Steel Sections (Imperial) Made for the Consett Iron Company Limited 

Fearn's Weight Calculator for Plates and Sheets 

Mear's Weight Conversion Calculator, Avoirdupois to Metric 