Production of a temperature organ

Material:

• Metal strip (100cm x 8cm)

• Tape

• Meter staff

• 2 Petri plates

• Thermometers or pyrometers

• Hot water (approx. 60°C)

• Cold water (common salt/ice mixture)

• Flea cancers in appropriate storage container

Execution:

From the metal strip one must make a gutter, masking therefore as the first the edges with tape with the tape that one does not cut oneself. One must attach now a scaling, which we divided into 10 cm of sections. We began however not completely at the edge, but a few centimeter removes, and from this a bending edge made, at which we high-bent the sheet metal. Now said like all 10cm a line, up to the conclusion. Now one bends also the other transverse side, and afterwards the long sides, so that one one run has.

Determine the temperature preference:

In order to determine the temperature preference, one fills the hot water in the one, and the common salt/ice mixture into the other Petri plate. One puts now the Petri plates in such a way that one can put the gutter on it. Next one must wait something, until an even temperature gradient of at least 30°C adjusted itself. (e.g. from 0°C to 30°C) one measures this occasionally again and again with the thermometer, or the pyrometer. If one has even gradients, then one provides a chart, whereby one clears away the distance of the side on the x axis (10cm, 20 cm…). On the y axis one clears away the temperature. For this makes to also still another appropriate table . Now a few flea cancers into the center give the temperature organ. Now every 5 seconds make a cross into the field of the table , which corresponds to the point of view of an animal, attention, per animal one needs its own table ! Now still another draw chart, evaluate and.

From 7 animals 4 animals preferred the colder water (approx. 8 °C), only 2 animals remained in a somewhat warmer range and an animal within the range of 20,4 °C always were.

By J