Twelve inch cylindrical metal rod, 'Merton's Helix

Made:
1948-1961

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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:
acrylic, metal and steel
credit:
National Physical Laboratory.