I’m trying to gather technical information on Turner and at some point will try to get that onto the thread. He’s a difficult target given that he did his best not to ever let anyone see him working. He’s like a phantom showing up only sporadically in anecdotal accounts.
Here’s one, an account by R.J. Graves, an amateur artist who sketched together with him:
At times… when they had fixed upon a point of view, to which they returned day after day, Turner would content himself with making one careful outline of the scene, and then, while graves worked on Turner, would remain apparently doing nothing, till at some particular moment, perhaps on the third day, he would exclaim ‘There it is,’ and seizing his colors, work rapidly until he had noted down the peculiar effect he wished to fix in his memory.