Physical description

.1 - Book - 20 pages + light grey cover, issued by the British Engineering Standards Association, British Standard Specification for "Cast Steel Wheel Centres for Electric Tramcars". Dated April 1922. Has standard Number 150-1922. Provides materials specification, testing and an index.



.2 - Book - 16 pages + light grey cover, issued by the British Engineering Standards Association, British Standard Specification for "Wrought Iron Wheel Centres for Electric Tramcars". Dated April 1922. Has standard Number 149-1922. Provides materials specification, testing and an index.

Inscriptions & markings

Both copies has the stamp of the "Tait Book Co. 90 William St. Melbourne" on the lower edge and in the top right corner, the ESCo Ballarat company stamp and the date "14 September 1923".