Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

138 however, employ it at higher temperatures, than 1400° Centigrades which has proved fortunate for the durability of the platinum winding. At some experiments where the temperature remained continually at about 1500" for some hours a quite new platinum- winding was burnt over after a very slight number of bur- nings. If, however, employed only at temperatures below 1400° Centigrade, a platinum winding can be reckoned upon lasting 700—800 burning hours. With the above named furnace have been made a greater series of experiments on the producing of c 1 i n k e r - com- pounds (Report VII of the Laboratory). Among the series of experiments of the Laboratory concerning researches; of raw materials for the producing of bricks are to be noticed its researches on the applicability of »Moler« for building and industrial pur- poses (Report IX of the Laboratory). »Moler« is a local denomination for the eocene, argillaceous, foliated diatomaceous deposit occurring in several places in Jutland and especially in the northern part of Mors, on Fur and elsewhere on the coasts of the Limfjord, thus a Silstrup and in Ertbølle Hoved. It has several times been tried to utilise »Moler« but without any result. The experiments of the Danish States Testing Laboratory were occasioned by the present director of the Royal Polyt. Institute, Mr. G. A. Hagemcinn, proposing to try the producing of sand- lime bricks by mixing lime, moler and sand. It became apparent, however, that the moler was not adapted to this. The Clay-Laboratory of the Danish States Testing Labora- tory now commenced to try the producing of bricks by mixing up clay and moler in different proportions. Moler was mingled with 25, 50 and 75 per cent of marl and with 25 and 50 per cent of red clay; it was also tried to burn bricks from moler alone. Il appeared from the burning that, contrary to our expectations, the moler alone gave a fine red brick, very firm and light; such a brick could have a nail knocked through without cracking. After this result all later experiments were made with un- mixed moler. It having been displayed that very light bricks could be pro- duced from the moler (specific gravity about 1) and nevertheless of the same strength as common bricks, the committee of the Clay-Laboratory, as above named, indebted for its founding to