H. Tinsley & Co.

Company

St Jérôme, QC

Smiths Falls, ON

St Jérôme, Quebec, QC (1952, 1956)

Churchill Crescent, Smiths Falls, ON (1958)

Electrical

Metrology

Manufacturing

Supplying

Subsidiary of: Tinsley Instruments (UK)

Successor: Guildline Instruments Ltd. (Smiths Falls, ON)

- 1952, May – UK company Tinsley Instruments opens a manufacturing branch in St Jérôme, Quebec. (“Bénédiction d’une importante usine à Saint-Jérôme.”)

- 1957, Nov. – Tinsley Instruments plant closes in St Jerôme and plans to move to Smiths Falls, ON (“Smiths Falls Gets New Firm”)

- 1958 – Tinsley Instruments active at Churchill Crescent, Smiths Falls, ON, selling scientific instruments (New Manufacturing Establishments in Canada)

- 1960, Sept.-1961, July – Name of Smiths Falls company changes to Guildline Instruments, suggesting foundation of new company during this window. (“Electrical Instrument Personnel”)

“Bénédiction d’une importante usine à Saint-Jérôme.” L'Avenir du Nord (May 9, 1952): 1

Dominion Bureau of Statistics – General Assignments Division. New Manufacturing Establishments in Canada, December 1958 (Gordon Churchill, Minister of Trade and Commerce, December 1958): 81

“Electrical Instrument Personnel” The Globe & Mail (July 13, 1961): 36.

“Guildline Instruments Celebrates 40 Years” Cal Lab (November-December 1997) (https://www.callabmag.com/wp-content/uploads/2020/10/1997Nov_Dec_Guildline-Celebrates.pdf)

“Smiths Falls Gets New Firm” Ottawa Citizen (September 5, 1957): 22