|An example of a mark caused by Plug and Feather|
Tuesday, 20 August 2013
Day 9- when they studied stones!
In the morning, the students carried on their normal routine. They finished their drawings and opened another trench, Trench D. In the afternoon Andrew, a geologist from Cardiff Museum came to show us about the different building materials both the upper and lower house were made out of. I took some documentation photos and learnt about different mason marks and how to tell the difference between different stones. It was interesting to learn the technique of quarrying known as 'Plug and Feather', where the stone was chiselled deep and moved around until the rock split into two.
The rest of the day, the students continued in their trenches. We are thinking of moving to the Upper House soon to open new trenches!