The New South Wales Government Railways constructed in 1903 a device for measuring the length of its lines of railway. That authority named the machine a Rotameter. It consisted of a four-wheel trolley with an additional large fifth wheel which traveled along the running surface of the rail. Its last recorded use was in the 1920s.
References
- "How Far is That? The Story of the NSWGR Rotameter" Australian Railway History, September, 2007 pp333-343
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