Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

to recommend for cleaning the stones before the fluating to perform this as throughly as possible with iron wire-brushes, for on fluating parts not well cleaned and then going on cleaning, there was danger that the cleaning with the wire-brushes should deposit so much iron on the stones, now hard, that the fluating afterwards caused rusty spots. 1. Testing of Bricks and Exminations of their Raw Materials. For the tests of these bricks, which since the starting of the above named Clay-Laboratory have been made here, the usual methods have been employed in examining their re- sistance to crushing, power of absorbing water, resistance to frost, contents of dissoluble salts, contents of injurious grains, adhesion to mortar etc.; further special examination have been made of the resistance to wear of c 1 i n k e r s1), of the permeability of tiles, of the resistance to the weather of glazed goods, of fire bricks as to their refractoriness, their constancy of volume during their burning, their resistance to change of tem- perature etc. As special researches on bricks may be quoted the following, some of which are treated upon in some of the 13 reports of ex- periments published by the Clay-Laboratory of the Danish States Testing Laboratory, namely 2. Comparative experiments of adhesion between »Moler« bricks and common bricks. 3. Drying experiments with »Moler« bricks, common yellow bricks and clinkers. 4. Comparative tests on strength of bricks burnt in brick-ma- nufactories and samples burnt at the laboratory. 5. Glazing on lime-charged goods. 8. Saturating and Colouring of the interior of yellow tiles. 9. Saturating of red tiles with milk that has passed through a cream separator. 10. Saturating of red tiles with water-glass. 11. Comparative researches on cement-bricks and common bricks. i) On this Report IV had alredy been published before the founding of the Clay-Laboratory.