Melvyn, thank you for the pictures.
I was interested to know whether there was ever much discussion (writings, letters, etc.) in the 19th century on the virtues, pro or cons of sod-wall bunkers. You mentioned that they stopped golfers walking up the face, but did any course/club ever make a conscious decision to convert some or all of their bunkers to sod-wall.
Did anyone like Allan Robertson or Old Tom have any thoughts on the subject that may have been written down?