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Chapter   1:   The   North   Jetty   Beacon
Maya   tested   a   new   beacon   from   the   end   of the   north   jetty
just   before   dusk.   The   lamp   sat   18.5   meters   above   the
water,   high   enough   for   its   beam   to   clear   the   boathouse
roof.
She   started   a   stopwatch   at   the   first flash   and   stopped   it at
the   next.   The   interval   was   42   seconds.   She   repeated   the
timing   twice   and   recorded   the   same   result.
Back   at the   dock,   Maya   logged   the   height   and   the   flash
interval   so   the   next   crew   could   repeat   the   test   from   the
same   spot.