PT  - JOURNAL ARTICLE
AU  - Mattheck, Claus G.
AU  - Bethge, Klaus A.
TI  - Detection of Decay in Trees With the Metriguard Stress Wave Timer
AID  - 10.48044/jauf.1993.058
DP  - 1993 Nov 01
TA  - Arboriculture & Urban Forestry (AUF)
PG  - 374--378
VI  - 19
IP  - 6
4099  - http://auf.isa-arbor.com/content/19/6/374.short
4100  - http://auf.isa-arbor.com/content/19/6/374.full
SO  - JOA1993 Nov 01; 19
AB  - The Metriguard Stress Wave Timer measures the time needed for a stress wave to pass from a hammer blow to a sensor on the opposite side of the stem. A calculated sound speed will indicate decayed or hollow spots within the stem. A table of velocities for healthy trees is given and also some examples showing cross-sections of trees containing defects together with the measured velocities.