White & Gillespie was founded in 1910 in Melbourne as a manufacturer of printing plates and specialist printer equipment suppliers. At the commencement of WWII in 1939 W & G became involved with the Australian War effort and began producing navigational aids and range finding devices and calculating tools for artillery.

After the war W & G continued making slide rules and other speciality instruments including LP record production and their own recording studios, however in 1977 the record and instrument plants were sold and production of slide rules stopped. I have been unable to determine exactly when that occured, however I have been advised that that division still exists as W & G and makes geometry templates and similar instruments for high school students. Thanks to Cyril Catt for that update, I shall have to track down a 'Mathomat' for display

White & Gillespie are still in business, although today they concentrate on their specialist printing business.