Kevin there’s a awesome video on the triple expansion engines of the USS Texas with excellent graphics that might help..
2020-03-09 01:39:41 +0000 UTC
Q & A: I’m not sure if this has been covered yet, but in a nut shell, what exactly are double and triple expansion engines? What were the pros and cons of both systems? Also, what exactly is bad coal, what were the effects of bad coal on the boilers, and how often did ships receive it then dump it out? ( just thinking back to the Kamchatka). Sorry for asking so many questions at once.
2020-03-07 17:45:07 +0000 UTC
Small mistake there in the fact the British actually did have purpose built landing craft at Gallipoli for the latter stages of the amphibious operation. They were called "X Lighters" (and nicknamed "Black Beetles") and they were used, quite successfully, during the Suvla Bay landings.
Here's more information: http://www.xlighter.org/ and https://weaponsandwarfare.com/2018/12/01/x-lighters/