#46999, "Additional info" In response to Reply # 1
The following is from "The Marine Engineer and Naval Architect" Vol. 30 (August, 1907 - June 1908):
LAUNCHES — Scotch.
Pontoon. — On October 25th, the Greenock & Grangemouth Dockyard Company Limited, launched from their shipbuilding yard at Greenock a large crane pontoon, dimensions 150 ft. by 86 ft. by 13 ft. This has been built for Messrs. Harland & Wolff, shipbuilders, Belfast, and is to carry the largest crane in the world to lift the gigantic weights required for their mammoth ships. The crane is being constructed by Messrs. Benrather Maschinenfabrik Actiengesellschaft, Benrath, Germany, and is to lift 150 tons to a height of 150 ft. and revolve right round on a radius of 100 ft. The pontoon has been constructed with 15 watertight compartments and has been specially designed by the builders so that it will be capable of taking the strain of the above load of 150 tons when revolving, and also so that the 150 tons load can be deposited at any place on the deck, the deck being specially strengthened for this purpose. The pontoon has been built to the design of the Greenock & Grangemouth Dockyard Company, Ltd., who are responsible for the strength of the structure. Before work was commenced the design and calculations were submitted to expert German constructors and the calculations completely verified.
#47003, "RE: Additional info" In response to Reply # 3
That's a nice illustration -- first time I've seen that one.
Regarding the pontoon, until coming across various period articles descrbing the crane, I had always assumed the same thing -- that H&W had build the pontoon upon which the crane floated.
This revelation makes me wonder what else was subcontracted on this particular job. Did H&W people outfit the pontoon with its boiler and electrical plant, or was this done at Greenock, too? And, what about the final on-site erection of the crane itself? There are quite a few pictures of this work being done at H&W in the NMNI picture archive, but was this work performed by H&W workers, or did Benrather send over a crew of their own people to perform this work? I don't suppose we'll ever know for certain.