Surveying Instrument Collection
Maker |
Thommen, Switzerland |
Model |
2A2.511.02 |
Serial Number |
220459 |
Dimensions |
110 x 135 x 145 mm |
Image |
|
Description |
Precision aneroid barometer dial readout (two hands). Range 500 to 1100 mbar (hPa). Least count 1 hPa, estimate to 0.1 hPa. The dial is graduated from 0 to 100 hPa. Short hand: multiply readout by 10 to get the coarse reading (multiples of 100 hPa). Users are advised to set up the barometer on a horizontal surface and to gently tap the barometer before reading to release any friction in the mechanism. For more information, see item 0170. |
History & comments |
Used for barometric heighting and for pressure measurements during (precision) electronic distance measurements. |
Conservation |
in steel case with leather strap handle |
Condition |
excellent, as new |
Remarks |
Marked 'Return to J. M. Rueger' |
Dates |
Catalogued by JMR in 2012. Photo by JMR. |