Wireless for the Warrior Compendium 2 ‘Spark to Larkspur’ (Special sets, Receivers and Larkspur) is published in a practical A5 softback format. It contains 215 different sets and systems in 458 pages, and over 1050 photographs, line drawings and tables. Included are a comprehensive index and a list of suggested further reading. Compendium 2 is divided into five main sections and sub-divided into chapters by application, operational use, range or family of sets, and date of introduction. The first section covers 'Special Sets' with chapters: commercial, RAF and other sets adapted for Army use; ground to air sets; special sets; miscellaneous and local pattern sets; experimental sets. The 'Commonwealth Sets' section deals with equipment manufactured and/or used in Australia, New Zealand and South Africa. 'Receivers' are covered in a separate section comprising chapters on: numerical series; commercial, RAF and special receivers adopted for Army use; Receivers manufactured in Australia, Canada and New Zealand; Army broadcast and welfare-amenities receivers. ‘Direction Finding receivers and Systems’ include chapters on rotating loop DF systems; commercial U-type Adcock DF systems; Army U-type Adcock DF systems; miscellaneous DF sets and systems. The final section covers the 'Larkspur' era of sets, including Anti-Aircraft Command sets.