Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed
År: 1909
Sted: Kjøbenhavn
Sider: 185
UDK: 6201(09)
Emne: Trykt hos J. Jørgensen & Co. (M. A. Hannover)
On the development of testing of materials in the north and on the work of the danish states testing laboratory in Copenhagen (english translation)
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119
Beside these examinations there are made a great number
(530) of analyses on the content of moisture in gun-powder while
all proper analyses on gun-powder and other explosives are made
at the powder-works of Frederiksværk.
Moreover it may be said that the Artillery besides shooting-
tests already at a very early lime used other tests of materials
for the testing and the judgement of the materials used for the
ordnance and the ammunition.
Thus, in the year 1771 there was made tensile tests at the
arsenal of Copenhagen by means of the socalled great Nuremberg-
weighing-machine which was placed there, to determine the
strength of gun-metal, whose composition — in the beginning
of the 19th century — was tested by analysing the metal of seve-
ral various bronze guns.
In the year 1805 there was stimulated certain impact tests
and drop tests before the acceptance of iron-axles for waggons,
as well as they also used impact tests and drop tests in the be-
ginning of 19lh century at the receipt of grenades and shells.
Before the acceptance of guns they also used impact tests.
Thus, complete impact tests were made at Stafsjö in Sweden at
Ihe receipt of 47 pieces of 84-Pds. Two test bars for each gun,
one with a circular the other with a quadratic cross-section were
placed with a certain distance between the supporting edges and
plyed with a ram of a certain weight and with increasing height
of fall, till Ihe bars were broken.
During the casting of Ihe guns belonging to the system of
1834 one or several test bars were cast at the same time as each
gun. These bars were broken with a hammer and the hardness
of the iron was determined according to the strength of the blow
and the appearance of the surfaces of fracture. Then a few discs
were turned of the test bars, and their specific gravity was de-
termined. These tests were used, till in the years 1877—78 they
besides began to test the quality of the iron by tensile tests,
whereafter they proceeded to use these.
d. Account of the Testing of Materials at the Royal Navy-Yard1).
As a rule the Royal Navy-Yard had in earlier times particular
rules for testing the more important materials it was furnished
Informations by Mr. I. C. Tuxen, director of the Royal Navy-Yard.