An electric wire puts it in contact with the patent log; this needle shows me the actual speed of my submersible.
一根电线把它跟测程器的螺旋桨连接起来，它上面的长针给我指出船行的实际快慢。
Patent log
原声例句
海底两万里（原版）
英语百科
Pitometer log
（重定向自Patent log）
Pitometer logs (also known as pit logs) are devices used to measure a ship's speed relative to the water. They are used on both surface ships and submarines. Data from the pitometer log is usually fed directly into the ship's navigation system.
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