1853. ANNALEN JVO. 8th.
PHYSICS AND CHEMISTRY.
BAND LXXXIX.
I. On the heat conductivity of metals;
by G. Wicdemnnn and R. Frnz.
tj. 1.
More than twenty years have passed since Hr. I) it p r e t z
through his painstaking investigations first some safe ones
Numerical values concerning the relative conductivity
whose firm body has been found by the windmills. -
The great accuracy and care with which the
Attempts have been made by Mr D esp r e t e
had rightly had the consequence that the
according to the then state of science
as a basis of our knowledge in
served the machined field.
Indefs it seemed desirable, the after the
The methods used by Mr D
Attention after Hgerer time once again a test
to subdue so much more than by the discovery of the
Thermostlule was a means, independently of man-
At the time of D espretz's work, it was inevitable
Sources of error, the examination of the wireless network firmer
Kiirper again vonunebmen.
Mr. Despre t z has rods of
square Qnerschnitt at one end by a
Heated, and at certain distances from that
The same book was drilled in the rods with mercury
were geftillt. By thermometers, which are immersed in this
could, the temperatures of the corresponding places
the rods observed, and from the Verhliltnib the vervarious observations of the temyeratures rclativeii lci
Ability to be prepared for
It is probably to be inferred in a slight way, that the hiiu
In addition to the contiuuiti of the rods
the mercury-filled holes of the right dividends
hindering the heat in the way.
This source of error appears in the observation method
Qb to be avoided, moreover, cbcn
first the thermocouple instead of the thermometer for the bocob
Beware of the temperature of rods, which are in contact with each other
Eudc cramps warcn, auwandtc.
Nevertheless, the experiments are no less necessary
The notes do not suffice for fully
to be on sight, in order to be on the same footing with the laws of Liberec
to lay the groundwork; These are so versuclie
to get more McMark
Method of temperature measurement as useful to crweise,
I really want to get comprehensive results.
Mr. L ngb e rg lowered the temperatures of his
heated at the end by boiling water
ge, by cr one from a prisinatic bismuth and
Antimony sticks composed thermocouple in different
distance from the Wiirmequelle to the Stan-
by means of a press on licfs, and at one,
Graduated electroplating connected to the element
meters each time excluded. - The Lsth
Place of the Eleineness wasins to a rectangubren plains
Flat from lmm, 7 lingings and omm, 7 wide filed; the
Thickness of the bars was 5 "", 87 - 9 "", 4.
In any case, it is with the greatest difficulties
kiiip, to the Andriicken the Lbtbfliiche of Thermo
elements to the curved points of the rods.
The device is always one
same contact between them is made bothu.
The first difference between the statistics and the statistics
inoclcines of the ilines prescribed Lap., mid
Passing through the whole of Taiigiruiig the Staiige
the leaflet for a free cantilever is attached to the
Create pole. In this case the communication of the
Wgme the rod to the Tbermoelement difficult, and
thus an inaccurate observation of the temperature acts
become.
A second complaint by Mr. Langberg
The clever arrangement of his apparatus seems to
biilife-like long duration of each verse and in the
Size of the Tbermoelementes compared to the only small
A cross-section of the warmed rods is to be found.
Mr. The length of the thermocouple lasts long (approx
3 minutes) to the pole, it is a constant tempera-
tur accepted. In this time, indefs is not
but an aliquot part of the in the convicted passage of the
Rod members of the Liith site have mitigated
but it is also of other parts of the Stangc
to the cooled by the thermocouple Stellc neuc
We are in fl uence, and as a result we have changed quite a lot.
in the pole, so that the
The temperature observed by the temperature sensor does not completely disappear
Observe the temperature of the rod at each point
is directly proportional. Such inaccuracy
Might have to enter so much, ah the thennoelement
in consequence of its unimportant dimensions a great one
Amount of waste can be deduced in a short time.
Furthermore, the long time of mooring must
The result was that the rod was taken from the pole
-Warming is continued in the thermocouple,
instead of just sharing it near his place of birth. On
This way can be through the inequality of the inner
Structure of the bismuth and antimony stingers, from Welclien
the element is composed, special ThermostrGmc
Show merden, which in one or the other
Meaning to which the expectation of the Llithstelle eneug-
These currents also add purity, thus also purity
to watch.
Miichtc also appeared in the papers of Mr. Laiig-
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