Canadian Jewellers Association · Toronto : Maclean-Hunter Pub. Co · leaf 1258
dififerencein longitude between Greenwich, London, and Le Bourget,Paris, by transport of time in an aeroplane. Twelvechronometers were carried, which had previously beenobserved for a total of fifty-three days at the NationalPhysical Laboratory, Teddington. The results of thetest were practiioailiy… … WEM
Jewelry · Jewelry trade
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
