Main Discussion Area > English Warbow
Where to cut yew
tannhillman:
The cambium is a very thin un-barky looking layer, on your pic I can see inner bark along the bow back with a bit missing in the area of the dip, and I can see what looks like the yellowish cambium layer remaining on the dip? But hey its not always so easy interpreting a photo! I have made a lot of yew selfbows and I always keep the cambium on as it, in my opinion, makes for a stronger bow as the sapwood remains unaffected, and it also protects the sapwood from future damage (like a natural integral backing). I have never known it to come off during tillering or during subsequent use of the bow, but I have had pieces of inner bark in and around knots that I hadn't removed pop off during tillering as you describe. I do remove the bark (inner and outer) early on in the process and leave the cambium on during seasoning.
The cambium is a very durable layer as illustrated by the fact that the majority of the MR bows had the cambium on, after tillering and then after another 400 years under water!!
:)
tannhillman:
Hi, have a look at this attachment which shows the cambium quite well. I have been working with wood for many years and cambium has always been this term used for the thin layer just above the sapwood. If you scroll to the bottom of the last link you gave there is a pic of someone removing the inner bark (I have attached), and the cambium can be seen beneath.
The references I have read in relation to MR bows have all used the term 'cambium' rather than 'bast' to describe the layer remaining on those bow backs, but different names can sometimes be used to describe the same thing.
I do think its important to get terms right and avoid misinformation as you say, as there is already far to much of that around the subject of yew warbows already haha!
Iain
DarkSoul:
--- Quote from: Del the cat on April 24, 2014, 05:07:30 am ---(...)
The article says it is the Phloem which carries the nutrients (not the sapwood which your doc states), and that is what I had always believed.
After all the sapwood isn't wet and slippery, it's the layer just above it...
DAMN!
Here's an article about sugar Maple that says the sap does flow in the sapwood! http://maple.dnr.cornell.edu/produc/sapflow.htm
It appears even the academics can't agree. Or maybe I'm scan reading and missing the detail.
--- End quote ---
Sapwood transports water from the roots up the tree, to the leaves where it will evaporate.
Phloem transports nutrients (dissolved in water) produced by the leaves from the leaves to the growing tissues that require nutrients, such as buds, root meristems and cambium.
tannhillman:
--- Quote from: DarkSoul on April 24, 2014, 08:14:44 pm ---
--- Quote from: Del the cat on April 24, 2014, 05:07:30 am ---(...)
The article says it is the Phloem which carries the nutrients (not the sapwood which your doc states), and that is what I had always believed.
After all the sapwood isn't wet and slippery, it's the layer just above it...
DAMN!
Here's an article about sugar Maple that says the sap does flow in the sapwood! http://maple.dnr.cornell.edu/produc/sapflow.htm
It appears even the academics can't agree. Or maybe I'm scan reading and missing the detail.
--- End quote ---
Sapwood transports water from the roots up the tree, to the leaves where it will evaporate.
Phloem transports nutrients (dissolved in water) produced by the leaves from the leaves to the growing tissues that require nutrients, such as buds, root meristems and cambium.
--- End quote ---
With reference to Dels comment above, the document I attached (to show the position of cambium on a tree) actually said the following in relation to Sapwood - "Sapwood is the tree's pipeline for water moving up to the leaves. Sapwood is new wood. As newer rings of sapwood are laid down, inner cells lose their vitality and turn to heartwood". It does not say that the sapwood carries nutrients! Iain
PatM:
I think you're confusing the oxidation on the last layer of sapwood as "cambium". When you peel bark, the cambium comes off with it.
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