Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

. ■ ■ 176 several of the tests for protective coatings which the Danish States Testing Laboratory has recommended. k. Experiments concerning Means for the Preservation of Wood. These experiments, made after the proposal of Mr. Irminger, Manager of the Eastern Gas-Works of Copenhagen, were also executed for the Church and School Department, and provisional reports have been given by the Testing Laboratory in Report XI and in the Annual Reports for 1907 and 1908 of the Danish States Testing Laboratory by Mr. Irminger, in the capacity of chairman of a committee that has designed them. For the experiments were employed pieces of wood of com- mon spruce, white spruce, pine and mountain-pine and oak, white spruce and mountain-pine, however, only either as fencing posts or in the form of laths as stands, on which were laid some pieces of spruce and pine horizontally above the earth. Besides, a very great number of experimental pieces were formed of common spruce, pine and oak in a quite fixed manner; then they were placed in the earth, either horizontally under the surface or with the upper plane (a marrow side) horizontal in the surface of the earth itself or vertical half buried in the earth; part of this ma- terial was left unprepared, while another and greater part was pre- pared in 82 different ways by painting, impregnating etc. The whole of the experimental material lies now at a distance of 6 km from Copenhagen at the station of Husum, in a ground kindly delivered up by the 2d Department of the Royal Engineers, and is seen at p. 85 in fig. 30, and the purpose is to examine by and by the influence made by the weather upon it. As yet but few results are before us, — see the Annual Reports of the Laboratory for 1907 and 1908 — but next autumn we in- tend to commence a close examination of the state of the material. The Report XI of the Laboratory gives the further details of the way in which the wood was cut out of the trunks, how it has been taken care of which side of the wood was turning north- ward, how notes were made on resin holes, diameter-increment, richness in knots, etc. Fig. 31 at page 87 shows the wood when piled for drying after being cut out. Before being prepared some researches were made of the wood. Thus determinations of specific gravity and humidity were