| 摘要 |
The moisture content of compressed air being supplied by a compressor 24 to propel an optical fibre line 18 along a duct is monitored by a dew point meter 22 and adjusted such that it is maintained within a predetermined range. The adjustment is carried out by passing the compressed air through two passages 30, 32 arranged in parallel with one passage 30 being provided with means 20 for increasing the moisture content of the air passing therethrough and adjusting the relative flow rates through the two passages.
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