Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

 139 »Skrikes Institution«, applied to the latter asking the Institution to grant 1000 Kr. to continued experiments and for obtaining the right of spading of a stratum of moler with well adapted moler and good shipping conditions. The design was both to prevent the manufacturing from being commenced with less adapted moler and possibly bringing a bad name upon moler- bricks and to prevent eventual advantage from a remunerative manufacturing based upon the researches of the Laboratory from devolving unjustly on speculators or the share-holders in question. On this occasion the chief-engineer of the Clay-Laboratory, Mr. Fischer-Möller, traversed the moler territory several times both in the company of Captain Loof, Hobro, and together with Dr. V. Madsen, State-geologist. On these travels they succeeded in finding an exceedingly well adapted stratum of moler at Ejers- lev pr. Mors. P. 40, fig. 12 shows a part of Ejerslev. In the place in question the cliff is 16—20 m high. To the right on the picture are distinctly seen strong throws and corrugations of the strata. The dark stripes are derived from strata of black volcanic ashes always following the moler. Where these strata of ashes occur in great quantity and density, they render the moler quite inapplicable for producing of light bricks. As it was to be supposed from the experiments made on a small scale by the Danish States Testing Laboratory, that in utilising the strata of moler at Ejerslev a new Danish industry could be started, the next step must be to try a manufac- turing in a brickfield, and Captain Loof kindly under- took the manufacturing in the brickfield of Vindø at Hobro, which is in his possession. The bricks whose moulding, drying and burning had caused several practical difficulties were now examined at the Testing Laboratory and, according to the bur- ning degree and treatment, displayed a resistance to crushing of from 86 to 230 kg pr. sq. cm. The specific gravity was between 0,87 and 1,13, the latter figure for the hardest burnt bricks. Their power of absorbing water was in all cases considerable and could attain 50 per cent. The most remarkable thing was, without doubt, the great strength of the moler bricks in proportion to their lightness and other light bricks in the market. Rhenish »Schwemmsteine«,. 10*