Specimens

V_L

V_RT

V_L/V_RT

Frequency

Method

(m/s)

(kHz)

S1

3964 ± 283

1412 ± 155

2.8

200

Non-contact

S2

3515 ± 180

1606 ± 92

2.2

S3

3468 ± 335

1331 ± 235

2.6

S1

4118 ± 240

1664 ± 147

2.5

200

Contact

S2

4164 ± 253

1677 ± 84

2.5

S3

4096 ± 410

1700 ± 130

2.4

Japanese cedar^a

4310 ± 339

1863 ± 9.0^c

2.3

500

Contact

1388 ± 15.1^d

3.1

Japanese cedar^b

4950

2150 ^c

2.3

2500

Contact

1610 ^d

3.1