http://www.britishpathe.com/video/launched-sideways-2

Tugs No 6, 11 and 12 for the LNER are launched in 1931

Looked at this before but always smile at the worker desperately trying to knock the last chock out of the way and then getting himself out of the way PDQ.

Now that was clever. I only posted the link, the rest was done by . . . . something

An interesting piece of film, good job there was not a number13, I wonder how many people practice sculling these days in the fashion shown in this film.