Spherometer, Simple

Used Primarily For The Precise Measurement Of Radius Of Curvature Of Curved Surfaces Such As Lenses And Mirrors. A Metal Disc Of About 40Mm Diameter, Graduated 100 Divisions, Rests On The Center Of A Metal Table, Through A Steel Screw. The Table Carries 3 Pointed Steel Legs At The Underside, Equidistant From Each Other. A Vertical Scale, Graduated 10-0-10Mm Also Mounted On The Table For Measurements. (Screw Pitch 0.5Mm, Reading 0.005Mm)