Twelve inch cylindrical metal rod

Twelve inch cylindrical metal rod, 'Merton's Helix'

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Twelve inch cylindrical metal rod, 'Merton's Helix'
Science Museum Group
© The Board of Trustees of the Science Museum

Twelve inch cylindrical metal rod, 'Merton's Helix', used to make primary and secondary rulings of 7500 lines/ inch, enclosed in perspex tube, 1948-1961.

Details

Category:
Optics
Object Number:
1961-253
Materials:
metal, acrylic and steel
Measurements:
overall: 387 mm x x , 51 mm, 1.84kg
type:
rod
credit:
National Physical Laboratory.