Sterling 600mm 60R Type Folding Line of Chords Rule
 
Metric graduations conform to the requirements of the B.S 4372 : 1968
 
• No. 60R
• 600mm Folding Ruler
• Determine circumference of circles from diameter measurements
• Used with dividers to measure angles
• Rustless steel with polished finish
• Permanent etched figures & graduations
• Instructions enclosed