Which preposition to use with sliders

of Occurrences 1%

Mr. Coleridge is too rich in intellectual wealth, to need to task himself to any drudgery: he has only to draw the sliders of his imagination, and a thousand subjects expand before him, startling him with their brilliancy, or losing themselves in endless obscurity "And by the force of blear illusion, They draw him on to his confusion.

Which preposition to use with  sliders