Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed

117 possible material so as to meet all demands of the Danish Engineer Corps. They are all in all an instance of the practical value of the testing of materials. b. Account of the Testing of Materials at the Danish State Railways. At the railway-division rails and connecting-materials, structural-steel and cement are tested after usual standards. At the machine division the following tests are made1 *): Caoutchouc. Determination of ash. Test of constituents soluble in 5 % alcoholic sodium-hydrate. Influence of healing in steam at 5—15 Atm. Influence of rapid cooling. Bending tests with heating-tubes. Coal. Determination of ash, sulphur and volatile constitu- ents. Determination of calorific-value. Oils. Determination of specific gravity, flash-point, bur- ning-point, content of acid, power of absorption at low tempera- tures and other properties at temperatures below 0°. Determi- nation of asphalt, evaporation at temperatures near the flash- point and the resulting increase in asphalt. Iron and steel. Testing of strength, bending tests after or without previous hardening, jumping tests, punching-tests and welding-tests. Plate- and e v o 1 u t e - s p r i n g s. Test of elasticity. Other metals. Tests of strength. Analyses, partly elec- trolytic. Textiles. Tests of strength. Microscopical examinations. Asbestos - and other packing -materials. rI en- sile tests. Treatment with high-pressure steam. Asbestos and Fibres for Isolation. Determi- nation of specific gravity. Determination of the contents of or- ganic substances. Sulphuric acid for accumulators. Testing of the presence of arsenic and chlorine. Determination of strength. Distilled water. Testing of the presence of chlorine. Minium, litharge for accumulators. Determi- l) After informations of Mr. Busse, director of the Danish State Railway (mech. department).