Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

and that these bricks were very often freezing to pieces, the thought very naturally struck the Laboratory of making these bricks go through the same tests as those made with the sand- lime-bricks, especially in order to discover, whether it was concei- vable that bricks, which freeze to pieces in nature, could stand the strap-tests. The bricks were taken from a large pile of bricks derived from the demolished Castle. Many of the bricks in this pile had frozen to pieces. The bricks were well burnt, their internal stucture being, however, as a rule rather heterogeneous. a. Testing of Resistance to Frost by the the Usual Method of the Laboratory. This test was made on 4 bricks, 2 of the bricks had been ex- tremely damaged, whereas fhe two were apparently quite un- damaged. p. Testing of Resistance to Frost by the Special Methods. 2) clasped into straps. After 25 freezings all the 4 bricks were apparently quite un- damaged. 3) standing on one header-side. 2 of the bricks had suffered very much, 2 to a certain degree. Then the 6 hitherto undamaged bricks were subjected to t h e usual test of resistance to frost, namely all the bricks, that had been clasped into straps and the two of the bricks from the usual test of resistance to frost. The 4 first named bricks were designated A, B, C and D, the 2 latter E and F. A, B and C proved to be very much damaged, whereas D, E and F were apparently quite unhurt. III. Discussion of the Results of the Experiments. As it according to the above seemed at any rate very pro- bable, that bricks could stand the strap-tests without really being able to resist frost, a new difficulty had been placed before the Laboratory. Hitherto had been considered only the possibility to introduce a new somewhat more lenient test, namely the strap- test, and leave it to the requirers themselves to decide whether they would prefer the more rigorous or more lenient test. But