[time-nuts] reply re Harrison's timing method - #13 in Vol 176, Issue 44 digest

[Steve Allen]

On Wed 2019-03-27T16:26:09+1300 Bruce Griffiths hath writ:
> The Danjon impersonal astrolabe is perhaps better suited to accurate measurements:
> https://www.nzmuseums.co.nz/collections/3267/objects/3380/astrolabe

Danjon became director of Observatoire de Paris (and thus also the
BIH) in 1945.  In 1948 the ITU realized that it could not make
reasonable regulations about frequency in the absence of an expert on
timing, so ITU requested the IAU send a representative to Study Group
7, and Danjon was that representative.  Danjon was head of the CCDS
from inception into the late 1960s.

The raw data about the clocks at Observatoire de Paris (which were
located in the catacombs for temperature stability) from the 1920s
into the quartz era are almost all published in Bulletin Horaire.  The
early issues are all scanned and online at Harvard ADS.  That is a
huge amount data on earth disciplined oscillators, a treasure chest of
descriptions and diagrams of early circuits and drum recording
devices, and a pile of dirty laundry about who made good and bad
decisions in international agreements about time.

--
Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
1156 High Street               Voice: +1 831 459 3046         Lng -122.06015
Santa Cruz, CA 95064           https://www.ucolick.org/~sla/  Hgt +250 m