Radiumchema Emanator Apparatus (ca. 1920s)
This is an early radium emanator designed to add radon directly into a drinking glass. To use it, water was poured into the top. Over time, the radon gas produced by the decay of the device's internal radium source entered and charged the water. The internal source (removed from this example) was a white ceramic cylinder.
Size: ca. 12" high, 3.5" widest diameter
Manufactured by the Radiumchema company in St. Joachimstal in what used to be Czechoslovakia. After World War II, the name of the town changed to Joachymov. See another product from Radiumchema.
Exposure rate: Daniel Gmünder has reported that the exposure rate at one foot from the 20,000 Mache Type C version of this unit was approximately 68 uR/hr above background.