I have read extensively about K7’s records, but have never seen any detailed description of the technicalities of timing of the runs.
My (limited) understanding is that many of the runs were timed by a team from Longines, using their own product -the Chronocinegines. In the 1950s and 60s, this device led the field in precise timing of sporting events and was definitely used by the Longines Team in the final record attempt by Donald Campbell and K7 in January 1967.
I can find few details of the Chronocinegines, but here is a short summary and I hope it helps:
“In 1954, with quartz timekeeping technology still in its embryonic phase, Longines launched the world’s first quartz clock with atomic precision, which was certified at Switzerland’s Neuchâtel Observatory.
That first quartz clock, which would go on to claim numerous subsequent precision records at the Neuchatel Observatory after its debut there in 1954, was integrated into a famous sports-timing instrument, the Chronocinégines (below). This device — which provided racing judges with a film strip composed of a series of pictures recorded at 1/100th second, allowing them to precisely record the moment an athlete crossed a finish line- represented a milestone in timekeeping history”
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