Fire resistance tests of leaves of deciduous trees by a cylindrical electric furnace

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  • 防火植栽の理論的並びに実験的研究 IX樹葉の抗火力比較試験(落葉樹)

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For the supplementation of the fire resistance tests of popular trees in Japan, reported by the writer on this journal in Vol. 33, p. 367_??_372, 1951, I made the following tests about deciduous trees and bamboos, covering 30 species, in September 1955.<br> Heating source was a horizontal cylindrical electric furnace maintained at constant temperature 500°C. Fresh leaves were carried in the heart of the furnace, hanging from hooks on a rail. Find the further descriptions on the equipment, processes and operations in the paper aforesaid.<br> Results obtained are shown in Table 2. Regarding the marks of the combustion types, see the paper above-mentioned.<br> Generally speaking, leaves take time for the blazing up as 7.5_??_19 seconds among deciduous broad-leaves, 10-28 sec. among evergreen broad-leaves, 22_??_40 sec. among conifers.<br> Deciduous broad-leaves seem far less fire-resistive than evergreens and are especially poor in the defoliation for the fire-preventive plantings.<br> Yet I have found some fire-resistive plants among them, such as Hydrangea macrophylla and Deutzia crenata in their foliate state. Species on the antipole are bamboos and next come Zelkowa serrata, Aphananthe aspera, Robinia pseudo-Acacia etc.

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