Whiteboard
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
White Watson
Possibly inspired by geologist John Whitehurst's 1782 diagrams of stratigraphic sections in the Matlock area of Derbyshire, in 1785 Watson presented Whitehurst with a diagrammatic 'Tablet', 'A Section of a Mountain in Derbyshire', made from samples of the rocks themselves. This innovative method of display not only showed an early understanding of the new science of geological strata but also formed the first attempt at documenting the stratigraphical structure of Derbyshire as a whole as opposed to the structure of specific localities as Whitehurst had. Over the course of his life, Watson would produce about 100 such tablets, accompanied with explanatory leaflets, and his papers contain sketches for considerably more. Unfortunately most of these tablets are now untraceable, although around fifteen are known to still survive.