The Thomas Dowrick Papers contain biographical materials, documents, including a diagram, pertaining to the whistle valve
invented by Dowrick and Chase, their patent on the valve, and the marketing of the invention by Viloco. The papers also contain
letters to and from Viloco concerning the whistle valve, and records of royalty payments to Dowrick and Chase.
Thomas Dowrick was born in England in 1890, and after serving an apprenticeship in a shipbuilding firm emigrated to the United
States. In 1917 Dowrick went to work for the Southern Pacific at Sacramento as a machinist. He later worked for the Atchison,
Topeka & Santa Fe, but returned to the Southern Pacific, eventually becoming a foreman at the Sacramento Shops.
Copyright has not been assigned to the California State Railroad Museum. All requests for
permission to publish or quote from manuscripts must be submitted in writing to the Senior
Curator. Permission for publication is given on behalf of the CSRM as the owner of the
physical items and is not intended to include or imply permission of the copyright holder,
which must also be obtained by the reader.