According to John, the car depicted in the photo on page 9 of Houdini Art and Magic (which I sent him for identification purposes) is a 1904 14 hp Humber Tourist Car that was made at the Humber factory at Beeston, Nottingham. This model car was only produced in 1904, confirming the 1900 dating of the photo in this book and elsewhere cannot be correct.
Says John, "You will see that the 14 and 25 hp were virtually identical apart from a different size of engine and a few other minor differences. It is possible to identify it as a 14 hp as the 25 hp had transverse front spring above the front axle whilst the 14 hp had two springs, these can be clearly seen in the photo."
Photo: Houdini Art and Magic
Furthermore, John has generously sent pages from a 1904 Humber catalog detailing the precise specifications and options of the 14 and 25 hp models.
Click to enlarge
A very big thank you to John Tarring of The Humber Register for helping with this previously unknown piece of Houdini history.