Batteries5 min read
Why a battery has more than one measure of health
A full charge, remaining capacity, power delivery and future life are different battery questions. Good measurements name the task, test conditions and limits of each result.
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Networks5 min read
Following a packet through policy and measurement
BGP policy, round-trip timing, and traceroute each reveal a different network. Reading them together takes more care than drawing a shortest path.
Hydrography5 min read
The zero beneath a harbour
Chart datum connects a sounding to a tide height. Its local reference, time period and uncertainty explain why the zero beneath a harbour needs a name.