Physical description
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.
Inscriptions & markings
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.