The pens from the Soil-Air-Thermograph and this Thermo-hygrograph. They are all quite blocked and the tips have gone missing. For the instruments to be usable these need to be completely replaced.
LONG RECORDING THERMO-HYGROGRAPH Range: TEMP. -20°C to +40°C HUMID. 0 ~ 100% Supply Source. 1.5 Volts d.c. Serial No. 209397 Date: May 1980 OTA KEIKI SEISAKUSHO CO., LTD. Like the soil-air-thermograph, the pens in this one are no good. They are completely blocked up and the tips appear to have gone missing. Combined with a lack of charts, this isn't much more than a display item.
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front |
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front open |
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plate |
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rear open |
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pens The pens from the Soil-Air-Thermograph and this Thermo-hygrograph. They are all quite blocked and the tips have gone missing. For the instruments to be usable these need to be completely replaced. |