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...Can anyone help Bob Macdonell with this query??
Dan MacIsaac
From: Bob Macdonell <RM16@swt.edu>
Subject: Spinthariscope
Have been looking for a source for a spinthariscope, but in vain.
The last known manufacturer/supplier was Sargent-Welch 1973-74.
.. A small amount of radioactive substance is positioned just above
the screen.