How does David Edgar use imagery in The Life and Adventures of Nicholas Nickleby?

Example of Imagery:

There, at the very core of London, in the heart of its business and animation, in the midst of a whirl of noise and motion: stemming as it were the giant currents of life that flow ceaselessly on from different quarters, and meet beneath its walls: stands Newgate; and in that crowded street on which it frowns so darkly--within a few feet of the squalid tottering houses--upon the very spot on which the vendors of soup and fish and damaged fruit are now plying their trades—scores of human beings, amidst a roar of sounds to which even the tumult of a great city is as nothing, four, six, or eight strong men at a time, have been hurried violently and swiftly from the world, when the scene has been rendered frightful with excess of human life; when curious eyes have glared from casement and house-top, and wall and pillar; and when, in the mass of white and upturned faces, the dying wretch, in his all-comprehensive look of agony, has met not one—not one—that bore the impress of pity or compassion.