Twelve inch cylindrical metal rod

Made:: 1948-1961

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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.

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Twelve inch cylindrical metal rod

Details

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