Untitled - English Heritage
Untitled - English Heritage
Untitled - English Heritage
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Figure A2: Cross-section of a rafter, showing sapwood rings in the left-hand corner,<br />
the arrow points to the heartwood/sapwood boundary (H/S); and a core with<br />
sapwood; again the arrow is pointing to the H/S. The core is about the size of a pencil<br />
Figure A3: Measuring ring widths under a microscope. The microscope is fixed while<br />
the sample is on a moving platform. The total sequence of widths is measured twice<br />
to ensure that an error has not been made. This type of apparatus is needed to<br />
process a large number of samples on a regular basis<br />
© ENGLISH HERITAGE 20 21 - 2012
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