Watson took a bath to freshener up after a long night out at the Sholto's and chasing Jonathan Small. (The Sign of Four) 

 

Bell-pull

This can take various forms but generally is it a heavy ribbon of cloth hanging next to the fire place or a handle (or level). Either way a bell is rung in the servants quarters.

 

Used by Mrs Hudson to carry the calling card of Miss Mary Morstan. (The Sign of Four)

 

A type of lantern used by the London Police. Holmes borrowed a bull's eye from the Sergeant who was guarding Bartholomew Sholto's Chamber following his death. (The Sign of Four)