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3 and four piece backs - particularly have been used for centuries and is a sensible use of valuable timber think Martin D35 where they introduced the 3 piece back to use up they’re stock of Brazilian r/wood that was to narrow.
Back in the hay day of Lutes and Vihuela they used multiple ’strips’ of timber to achieve the highly vaulted backs, often in contrasting woods to aesthetically enhance the look. It is also more economic way of going about things as two wide plates to join as a back would cost X times the equivalent area made up narrower strips.
Piano soundboards are made from a great many <> 4’ strips of high quality QS timber and with the multiple glued joints - it doesn’t seem to have a detrimental effect on the structural stability or the sound quality - if done right.
Another reason for building using multi piece tops / backs is that you can build with ultra high grade ‘Master’ timber at an affordable cost.
http://www.lutesandguitars.co.uk/images/JB5c.jpg
http://www.lutesandguitars.co.uk/images/JB5c.jpg
and the excellent Bernard Lehmann’s guitars, check the link below if u’r into ‘craftsmanship. -
http://www.dreamguitars.com/detail/5170-lehmann_master_model_2000_476/
http://www.dreamguitars.com/products/lehmann/lehmann_master_model_2000_476/images/bfull.jpg
try this -
http://www.lutesandguitars.co.uk/images/JB5c.jpg
Ah - sublime
the fillet on your guitar looks like maple that has 'aged' some by - could be one of many lighter colourd woods though
BTW it looks like theive put 'fllets' between the joints on the top as well - Cedar ? .
If you can get a good closeup - in focus, of both I'll have a better idea, just outa.
BTW #2, a properly executed glue with the glues used in instrument making is actually stronger than the wood.
We test for this - how ?, when we're trying a new glue - get two blocks of wood of the same type were gonna use - glue them together under correct clamping pressure and next day put it in a vice - gripping the lower block - now with a hammer smash th top block with a sideways swipe, if the joint / glue is good, the wood / fibers ( splinters) will be torn from the glue.
Aliphatic resin glue (Titebond) and Hide glue create good joints.
Sorry this seems to have swerved off topic.