Current issue: 53(3)

Under compilation: 53(4)

Impact factor 1.683
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Silva Fennica 1926-1997
1990-1997
1980-1989
1970-1979
1960-1969
Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Articles by Pentti Nisula

Category: Article

article id 4761, category Article
Pentti Nisula. (1968). Ehdotus metsikön kuution ja käyttöpuuosuuden määrittämiseksi. Silva Fennica vol. 2 no. 1 article id 4761. https://doi.org/10.14214/sf.a14545
English title: A proposal for the determination of total volume and utilization per cent of standing timber .

The present study gives an account of the dependence prevailing between the actual volume of timber crops, and, on one hand, the sum of cylindrical volume of individual trees, and on the other hand, the utilization per cent. This dependence is rectlinear if the volumes in question are calculated on a running-foot basis. The cylindrical volume of individual trees was calculated on the basis of cross-section area at breast height and the height of the trees. On the basis of the results, it seems that it is possible to simplify timber measurement.

The PDF includes a summary in English.

  • Nisula, ORCID ID:E-mail:
article id 4706, category Article
Pentti Nisula. (1961). Aikakello- ja pistokoemenetelmän vertailu. Silva Fennica no. 112 article id 4706. https://doi.org/10.14214/sf.a14233
English title: A comparison between the stop-watch method and the random-sample method.

The aim of this study was to find out to what extent it is possible to time phases of work by making instant observations at regular intervals according to the principles of the method of random samples, and arrive at similar results as obtained by timing continuously with a decimal-minute stop watch. In the first mentioned method the observer of the time study is given a sound signal at even intervals, in this case each 1/10-minute period, during the signal he records the phase of work (element) the object is performing.

The material of the study consists of studies in skidding and loading in connection with transportation by tractor during a period of 8 days. The duration of each element in using tractor hand in skidding and hauling was measured with an ordinary stop watch using repetitive timing. This material was then converted into random sample material.

The analysis of the material showed that the method of random samples yielded observations from all phases of work present in the material obtained by measuring with the stop watch. The duration of elements as determined by the random-sample method were of the same order as determined with stop watch. The results did not cause any observable systematic deviation or rhythmic repetition of elements.

The PDF includes a summary in English.

  • Nisula, ORCID ID:E-mail:

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