What job does Holmes want cartwright to do in the hound of baskervilles?

In "The Hound of the Baskervilles," Sherlock Holmes wants Cartwright to repair the ancient, broken-down hunting horn that was found in the moor. He believes that the horn, which was a family heirloom of the Baskervilles, could hold crucial clues to the mystery surrounding the deaths of Sir Charles Baskerville and the legend of the hound.

Here's why Holmes wants Cartwright to fix the horn:

* To reveal any markings or inscription: The horn might have markings or inscriptions that could help decipher the history of the Baskerville family or the origin of the hound legend.

* To examine its material: The type of metal used to make the horn might offer insights into its age and origin, which could be significant in understanding the curse.

* To test its sound: Holmes believes the horn could be a tool for communication, potentially used to signal or summon something.

Cartwright, a local craftsman, is the best person for the job due to his expertise in repairing and restoring old hunting horns.