What thing represent from music publisher E.T. Paull produced on the cover page announcing the ‘Dawn of the Century’?

In 1900, a popular music publisher E.T. Paull produced a music book that had a picture on the cover page announcing the ‘Dawn of the Century’ at the centre of the picture is a goddess-like figure, the angel of progress, bearing the flag of the new century. She is gently perched on a wheel with wings, symbolising time. Her flight is taking her into the future. Floating about, behind her, are the signs of progress: railway, camera, machines, printing press and factory.