The board of visitors for a prison and any member of the board shall hear any complaint or request which a prisoner wishes to make to them or him.

The board shall arrange for the food of the prisoners to be inspected by a member of the board at frequent intervals.

The board shall inquire into any report made to them, whether or not by a member of the board, that a prisoner’s health, mental or physical, is likely to be injuriously affected by any conditions of his imprisonment.