Letter from Sir John Franklin to his relative Joseph Kay, including on the taking-on of Kay's son, Henry Kay, as part of the crew on Franklin's ship, H.M.S. Rainbow, and the future use of steam power on ships Discusses how Henry might join HMS Rainbow.  To go to Corfu as senior officer: corrects some of Mrs Kay's assumptions about the significance of being senior officer.  Reports positively about HMS Rainbow's facilities and officers.  Describes recent voyages and remarks on the antiquarian interest of the locations seen.  Grateful for the account of Mr Braithwaite's steam vessels.  Speculates about the future use of steam power in the event of war.  Would like there to be news of Ross.  Has had letter from Back seeking advice about getting employment.  Thanks for dealing with the letting of the [London] house.  Gives detail about how to address future letters. 6 Apr 1831