I worked on some of the former Tangye ground......
The last image was taken in the mid 60s by me as were the ones of DAC. I would assume much of the wallwork was new when DAC opened their third foundry but if you look closely at some of the brickwork irs possible to see new brickwork and also areas where windows and doors shave been bricked up. Presumably DAC used as much of the original structure as possible. There was a stainless steel stockholder next door, R.G. Brown (Stainless Steel) Ltd, there structure was also a former Tanyge building. Cornwall Road was, of course, named after the celebrated brothers.
Apart from making jacks they were famed for their gas engines, these ran of twon gas and would be used to drive machinery via a belts and pullys ect. There are many of thes engines in various museums. My father tipped me off about Tangyes being demolished so i went down to photograph this landmark befire it all went, ironic that a few years later I would be working on the same site. My father was also and engineer as he was assistant works manager at A.E Grifiths who had works in Booth St and Rolfe St, I seem to remember him saying that the Tangyes did not seem to move with the times and slowly lost work, this seems to certainly be the case as it closed during one of Britains boom times.