Book - 36 pages + light grey covers, pushed by the British Standards Institution, British Standard No. 827 - 1939, titled "Radio-Interference Suppression for Trolley Buses and Tramways". Provides an index page and many drawings.On top right hand corner has stamp the SEC stamp, Ballarat Branch and a received dated of 6 Oct. 1939. Has "Mr Morrison" in pencil on the cover.trams, tramways, tramways, electrical equipment

.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. 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". trams, tramways, tramways, electrical equipment, wheels

.1 - Book - 56 pages + grey covers, side stapled, issued by the British Engineering Standards Committee "Electrical Machinery excluding motors for traction purposes", No. 72-1917, September 1917. Has "Commonwealth Engineer" label along the bottom edge. .2 - Book 28 pages - light grey covers, side stapled, issued by the British Engineering Standards Association, "Insulating oils for use in Transformers, oil switches and circuit breakers" No. 148-1923, April 1923. Has a Tait Book Co. stamp along the bottom edge and ESCo date stamp 1 Oct. 1925. Printed by Gaylard & Sons London. .3 - Book 72 pages - light grey covers, side stapled, issued by the British Engineering Standards Association, "Tungsten Filament Electric Lamps" No. 161-1925, August 1927. Has a Tait Book Co. stamp along the bottom edge and ESCo date stamp 15 Feb. 1928. Printed by Waterlow & Sons London. .4 - Book 48 pages - light grey covers, side stapled, issued by the British Standards Institution, "Metal Sheathed paper insulated plain annealed copper conductors for electricity supply including voltage tests" No.1 48-1933, March 1933. Has a Tait Book Co. stamp along the bottom edge and ESCo date stamp 15 Feb. 1928. Printed by Waterlow & Sons London. trams, tramways, power station, standards, materials, electrical systems