Piche Evaporimeter
Tube Diameter 14mm
Tube filld to 30ml
Disc Diameter 40mm
This is my first attempt of making a traditional Piche Evaporimeter. I am using a perspex tube 14mm diameter 510 mm long.
For the top I used a small plastic lid , then drilled a small hole in the top and threaded some wire through to make a loop. I filled the lid with hot melt glue and pushed the tube into the lid.
The bottom where the blotting paper circle will be fixed I have cut 2 doughnut rings out of a piece of 5 mm foam X plastic. It was very easy to cut the material using a cutting compass, I then embedded 4 small magnets into the 2 plastic discs, these need to be just below the surface of the plastic and must align exactly to each disc. Take one of the plastic discs apply some adhesive to the inner circle and attach it to the Perspex tube. The next stage is to cut some filter paper/blotting paper at 40 mm diameter, fill the plastic tube with distilled water then place the filter paper on top of the retainer ring.
Place the second disc underneath, the magnets should lock both discs together with the filter paper in between them. You will need to work out a ml scale, I have made one which has a 0.1ml scale.
TOP
Welcome to Weather-Above
1/ first fill the tube with distilled water
2 / place filterpaper between filter holder
3 /turn the tube upside down so the filter becomes moist position the tube to hang from a fixed hook
4/ make sure the paper filter is moist, slide down plastic marker 1 to the top of the water, this is where you will measure from.
After 24 hours slide plastic marker 2 to the water level using digital calipers, measure between the two markers this will give you the amount evaporation over 24 hours.
Bottom platform with four magnets
Top platform with four magnets
Large Lid {rain cover }
Filter Papper
I have calibrated this tube with a millilitre scale,I had this printed onto some outdoor clear vinyl it was printed in reverse so the scale is magnified through the water.The artwork is in a PDF file format,
Please click on the image
to see a larger image