I’ve been reading up on the subject of these 2 ships. Isn’t the internet just fantastic?
Wiki:
“Erebus (378 tons bm) and Terror (331 tons bm) were sturdily built and well equipped, including several recent inventions.[14] Steam engines were fitted, driving a single screw propeller in each vessel; these engines were converted former locomotives from the London & Croydon Railway. The ships could make 7.4 km/h (4 kn) on steam power, or travel under wind power to reach higher speeds and/or save fuel.[15]
Other advanced technology in the ships included reinforced bows constructed of heavy beams and iron plates, an internal steam heating system for the comfort of the crew in polar conditions, and a system of iron wells that allowed the screw propellers and iron rudders to be withdrawn into the hull to protect them from damage.
The ships also carried libraries of more than 1,000 books and three years' supply of conventionally[clarification needed] preserved or tinned food.[16] The tinned food was supplied from a provisioner, Stephen Goldner, who was awarded the contract on 1 April 1845, a mere seven weeks before Franklin set sail.[17] Goldner worked frantically on the large order of 8,000 tins. The haste required affected quality control of some of the tins, which were later found to have lead soldering that was "thick and sloppily done, and dripped like melted candle wax down the inside surface".”