One of a set of beta electroscopes developed and patented at Chalk River in the 1940s under the leadership of Hugh Carmichael for the accurate measurement of radioactivity. This Type T.Q.V., Serial No. 19, specimen is believed to be a precursor to the more sophisticated and polished Type T.Q.Q.B. models (Artifacts 2023-015 and 2023-016). It is built on a 21 cm diameter circular, adjustable base and stands 35 cm tall. Partial disassembly led to the discovery of the hemispherical copper base on which a ~1mm thick mounting post exits from which, under “just-right” lighting, the crucial, ~6 micron thick, gold-plated, quartz indictor fibers are mounted. This unit bears an NRX number tag of T 4057.
