Lots of correct answers this week! The zoomed in #WhatIsItWednesday image was the Boiler House at the Lady Victoria Colliery.
Twelve of these Lancashire boilers were installed in 1924 to power the Lady Victoria winding engine. Eight of them are still there today.
#DYK that before coming to Newtongrange they were used in His Majesty's Munitions Factory at Gretna in Dumfries and Galloway? The factory opened in 1916 to produce Cordite, which is a substance similar to gunpowder that was generally in demand during World War 1. The factory closed when the war ended and very little of it has been preserved. The boilers are almost all that is left of this important part of Britain's war history!