Abstract
In the 5th F. R. I.′s Fire Experiment, I have taken measurements with thermopiles of the effect of the shielding protection by a formal shaped tree from the radiation of wooden houses fire.
One of the aims of this measurements was to check the accuracy of the estimation formula submitted by the writer of the above effect (The Bulletin of the Fire Prevention Society of Japan. Vol. 1. No. 1. 1951), using the solid angle projection method.
In the comparison of the estimation with the measurement it was revealed that
i) the error due to the dealing of the shape of trees as globes will be small, as far as they are formally conical,
ii) but the dealing of shapes and sizes of the heat sources will affect vitally the accuracy of the estimation.
