What does the Ghost of Christmas Present do with his torch at the Cratchits' house?

The Ghost of Christmas Present blesses the Cratchit home with the sprinkling of his torch.

And perhaps it was the pleasure the good Spirit had in showing off this power of his, or else it was his own kind, generous, hearty nature, and his sympathy with all poor men, that led him straight to Scrooge's clerk's; for there he went, and took Scrooge with him, holding to his robe; and on the threshold of the door the Spirit smiled, and stopped to bless Bob Cratchit's dwelling with the sprinkling of his torch.