An extremely fine Crookes Spinthariscope in original case c.1903.
Doubly signed “Spinthariscope, W. Crookes, 1903” and “Thos. Armstrong & Bro., Manchester, 657”, it retains all of it’s original golden lacquer, adjustable focal length by threaded eyepiece with lens, gold pointer with radium sample at tip (adjustable by knurled nut) sitting atop a zinc sulphide screen with blackened end cap. Original black card case measures 6 x 3 cm. in diameter.
Crookes came upon this phenomenon quite by accident and marketed it
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