Signedunsigned
Historical AttributesDesigned by Robert V. Pound and Ronald W.P. Drever for the second round of graviational red shift experiments in 1961. According to Pound (article in object file), the counter would have bee n filled to atmospheric pressure with a gas mixture consisting of 90% argon and 10% methane. One of two constructed.
ProvenanceRemoved from Jefferson Tower in 2003, and transferred to CHSI.