Mear Electric Lighing Calculator

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Country of manufacture: England,            Date of manufacture: ____
Diameter: 19.5 cm,      Weight: 164.0 gms
Materials: all plastic
Scales: numerous, specialty
Front
     Outer Disk: Lamp Lumens per Fitting, Instructions for Use, Length of Room in Metres, Room Index
     Inner Disk: Width of Room in Metres, Required Illuminaton - Lux, Table - Minimum Mounting Height of Open Industrial Fittings,. Explanation - Maximum Spacing Between Lines of Fittings, Length + Width of Room - Metres
     Cursor: Number of Fittings, Coefficient of Utilisation, Height of Fitting Above Working Plane - Metres, Instructions for Use
Back
Type of Fitting, Table of Corresponding Coefficients of Utilisation as functions of Room Index Values and Wall/Ceiling Reflection Factors, Instructions for Use
Condition: C2 (Mint but no manual)
Came with: Red plastic slipcase w/snap closure

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