I have not read it, or even seen it, but there can't be too much to it as it is only 24 pages long. So I would assume it is a generalized overview of the big names in the business of the time.
Here is what I have found out about the book:
Peirson, J.Gordon. Great Ship Builders, or the Rise of Harland and Wolff. London: A.H. Stockwell. 1935. 24pp. isbn: none. scarcity: very scarce. [with special reference to Sir E.J. Harland and Gustav Wolff]