UKTC Archive

Re: Diameter callipers

Subject: Re: Diameter callipers
From: Wayne Tyson
Date: Aug 13 2019 18:04:38
I used to work with really big diameters (well in excess of ten feet) and
even larger bases that made dbh irrelevant and guessing too risky. In that
case, three long, perfectly straight boards, with at least two of them long
enough to reach the point above the larger base would be needed with two
carpenter's squares, two or three workers, and ladders. One also could
could use a non-stretchable length of wire-rope cable and nails into the
bark to mark dead-level, mark it, then measure it and calculate the
diameter. Long ladders might be needed. The easy way? Pick a smaller tree
for site index.

If I remember correctly, the Biltmore stick maxes out at 36 or 48 inches
dbh.

Wayne

On Tue, Aug 13, 2019 at 10:36 AM Bill Anderson <
anderson.arb.original@xxxxxx.com> wrote:

Just guess at it Graham, you're unlikely to be far out. And greater
accuracy than a generous estimate is unlikely to be needed.
Bill.

On Tue, 13 Aug 2019 at 18:29, steve vessey <steve.vessey73@xxxxxx.com>
wrote:

Hi

If the level of accuracy is not a high priority and the trees are not too
big you could try a normal carpenters tape? I use one in forestry surveys
for a quick idea of diameter.
Failing that try Sorbus international or Buxtons for calipers. Prices
range
from £60 upwards depending on size. Or go for the high end pairs with
gator
eyes which use 2 green lasers to determine diameter. Price for these are
about £800 though I think?

Tree Generation
Lincolnshire
07719 XXXXXX

On Tue, 13 Aug 2019, 17:41 Graham Joyce, <gmj@xxxxxxxxxxxxxxxxxxxxx.co.uk

wrote:

Dear all

having spent another brambly afternoon on a wet Devon bank failing to
retrieve the loose end of a diameter tape, I’m wondering if there’s an
easier way. Has anyone out there tried using forestry callipers to
measure
dbh? If so has anyone got any suggestions as to a useful make? I
realise
it’s not as accurate as a diameter tape, but times and places...

Thanks






----------------------------------------------------------------------

Graham Joyce B Sc (Hons), Dip Arb (RFS), M Arbor A, Tech Cert Arbor A
Managing Director
Advanced Arboriculture Ltd
Venmore Barn
Woodbury
Exeter
Devon
EX5 1LD







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