What is referred to by 'a finger joint'?

Based on the clue 'a fine series of these paintings on fresh plaster ...', what is the answer? Based on the clue 'a fine soft goatskin leather tanned with sumac or ...', what is the answer? Based on the clue 'a fine voice is as clear as one of these tintinnab...', what is the answer? Based on the clue 'a finger bone or a group of heavily armed infantry...', what is the answer? Based on the clue 'a finger stick is done to draw this', what is the answer? Based on the clue 'a fire ant mating call contest is part of the fire...', what is the answer? Based on the clue 'a fire eater makes sure the flame is out before op...', what is the answer? What is associated with: a fire in 1851 destroyed some 35000 volumes in its collection?