A Tubular Westinghouse Stopper Lamp

The only Westinghouse Stopper Lamps seen by this writer have had bulbous envelopes. A lamp with a different shaped envelope is mentioned here for the benefit of those web site viewers who also have that experience. A Letter to the Editor appeared in the Electrical World on Nov 21, 1914 (Vol 64, No 21, pg 1012) in which a photograph was shown of a Stopper Lamp with a tubular envelope as well as the bulbous one. A scanned picture of that photograph is given below.

These two Stopper lamps had been in the archives of the law firm of Sheffield, Bently, & Betts. They had been submitted by the Westinghouse Company in 1892 for the purpose of determining whether or not the designs infringed on the Edison patent No 223,898. It is not known if the Stopper lamp was actually manufactured with a tubular envelope or whether this lamp was simply a "one-of-a-kind" sample.