Which element can a composer use to lengthen the duration of a tone?

Rewrite the passage to improve expression.

Review paragraphs 12-15 of the short story, where della goes to get her hair cut at madame sofronie’s. use this “unseen scene” as an inspiration to write your own scene in which you imagine what the two characters might be doing and saying as the haircutting progresses. or you may want to imagine the scene in which jim sells his watch to buy the combs for della.

The invention of photography was initially important because