Browning's spectroscopes : spectrum apparatus for the microscope ... / John Browning.

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<p>Advertisement showing a line drawing of the device and a cross section illustration too. It is on the cover of the Thursday, 9 August 1877 issue of a "... Journal of science" (no. 406, Vol. 16). This copy lacks the top giving the full name. Advertisements for London hospital medical schools on the other side.</p>

Browning's spectroscopes : spectrum apparatus for the microscope ... / John Browning.

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