The Book of the Douglas (6th Edition)
A Complete Guide for Owners of Douglas Motor-cycles
by Leslie K. Heathcote
Published by Sir Isaac Pitman & Sons, Ltd., 1948
Hardcover, 82pp.
From the preface:
"This handbook on the Douglas machine has been written with the object of providing information on the 1929 to 1939 models, and therefore does not deal with any one particular model. The first edition of the Book of the Douglas was produced so long ago as 1925, so it will be obvious that a great many models have been manufactured since, quite a number of which are 'still going strong,' and much of the information contained in this edition will be of assistance to the owners of these pre-war machines." "The basic design of the Douglas, i.e. the horizontally opposed flat-twin engine, has been unchanged since it was first introduced in 1907, which is a remarkable tribute to the far-sighted policy of the Douglas engineers."
