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PERCIVAL MARSHALL & CO.,
RADIUM SPINTHARISCOPES.
AS DESIGNED BY
SIR WILLIAM CROOKES, F.R.S.,
For Demonstrating the Radio-activity of Radium.
KUNZITE.
THE NEW MINERAL.
Responding in a high degree to the Emanations from Radium.
ZINC SULPHIDE SCREENS. CALCIUM SULPHIDE--Phosphorescent. ZINC SULPHIDE--Phosphorescent. PITCHBLENDE--Specimens.
RADIUM APPLICATORS
Its employment in Therapeutics and for scientific research.
RADIUM
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