Just what I need for this winter.


LINKY

those things have been around for quite a while.
The impressive ones are on the amphibious things used to chop up floating ice

Really amazing given the date of that thing.

A couple of points I found best however:

1) The competitor test - the competition to this vehicle is.. a horse.

2) The advert - this amazing machine pre-dates movies with sound!

Amazing, what a great piece of black and white film for a brilliant invention. Did they ever make it to production?