We selected 4 Japanese larch trees. We cross-cut 4m long logs from every trees at the part that is upper 1.2m height from ground level. We obtained 18 logs in total, and we cut all logs to 2 shorter logs that were 1m logs and 3m logs in length. The former and the later logs were used for preparing small clear specimens and timbers, respectively.

We investigated radial distribution of MOE in cross-section of logs using small clear specimen. MOE increased linearly from pith to bark, and the pattern of distribution were similar at all position from ground level. By these MOE of small clear specimens, we standardized the MOE distribution patterns in cross-section. We measured MOE of logs using "longitudinal vibration method". These MOE indicated average values of those in cross-section of the log. We constructed the equation to estimate MOE of timbers at particular position in cross section of the log using distance from pith, diameter and MOE of each log.

We prepared sawn timbers ("2x4 lumbers" (38mmx89mm) and laminae (30mmx145mm)) were sawn from 3m long logs. We measured MOE of all timbers by longitudinal vibration method. We compared these "measured MOE values" with the "estimated MOE values". High correlation were observed between "estimated values" and "measured values".