How to pronounce “gasometer” in English

What you are seeing is the view from the top of that very tall train shed, the covered area where the trains come in and out, a great Victorian buildingof the 1860s. The gasometer there, the gas holder is a bit of a giveaway.And I show you this now lost view, because this is where they built the Eurostar extension, just to perhaps introduce a sense of the railways as a world apart.