The Lambrecht Wettersäule ("weather column") in Sils is one of the last 25/30 remaining in Switzerland. A hundred of them were placed between 1890 and 1930.
Wilhelm Lambrecht (1834-1904) was a German builder of measuring instruments.
You can learn more about Wettersäulen and Wilhelm Lambrecht on the following web sites:
Wettersäulen: Wikipedia (German)
Wilhelm Lambrecht: Wikipedia (English/German)
Lambrecht-Wettersäulen in Switzerland: meteoinst.ch (German)
The cache.
It is hidden in a less muggled position. We're all familiar with spreadsheets so it should be simple to calculate the coordinates.
The final coordinates are:
N 46° 25,UVW
E 009° 45,XYZ
On the Wettersäule you'll see a table, the "Meteorologische Notizen", with 14 columns and 5 rows. And:
UVW = (K3*G2) + (E3+G3+N3)
XYZ = (F3*F2) + B4 - (H5-F5) - F2
Please leave the cache in the same exact position you find it - but it should be obvious :-)