| 1872/3 | Wheel-train restored. Airy considering changing its gridiron pendulum for a mercurial one (Report to Board of Visitors) | ||
| 1873/4 | Moved to Transit Circle Room for use with the Transit Circle while Hardy was being renovated and then transferred to Shepshanks Dome to replace Earnshaw which was being lent for the Transit of Venus. Airy records that Arnold 1 was 'placed in the Transit-Circle-pit for use in observations of Circumpolar Stars, &c.' At this time, Airy was now contemplating changing gridiron pendulum to one of zinc and steel (Report to Board of Visitors). Despite what Airy wrote, Arnold 1 still retained a gridiron pendulum on 1 January 1909 when Christie compiled a list of clocks at the Observatory (RGO7/44) | ||
| 1890 | In North Dome, described as 'having contact apparatus similar to that in the clock Hardy, in order that the clock may, if required, be temporarily used in the place of Hardy or of the Sidereal Standard Clock (Introduction to Greenwich Observations p.xxiii) | ||
| 1893 | In North Dome (Introduction to Greenwich Observations p.xxvi) | ||
| 1894 |
In North Dome (Introduction to Greenwich Observations p.xxvi) | ||
| 1895 | Not mentioned in Introduction to Greenwich Observations | ||
| 1896 | Mention in Introduction to Greenwich Observations (p.xxvi), but no location specified | ||
| 1906 | No longer used as the reserve for the sidereal standard clock, Dent 2 having been repurposed for this role. (Intro) | ||
| 1909 | According to the Annual Report, between 11 May 1908 & 10 May 1909, it had replaced Graham 2 in the Thompson Dome, (Graham 2 having been sent to Dent & Co. for repair prior to being sent to Malta for longitude determinations on 5 Feb). Note: Arnold 1 is mentioned in the Introduction to the 1909 volume of Greenwich Observations (p.xx), but no location is specified. Still used as a with ATC when Hardy our of action (Intro) |
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| By | 1911 | According to the 1911 inventory, it was one of two clocks in the Thompson Dome, the other being Dent 2016. Both had bee removed by 1926 (at different times?) and replaced by Dent 2014, which had been in the Astrographic Dome (Inventory: RGO39/4/60 & RGO39/5/222) | |
| By | 1926 | In New Chronometer Room (Inventory: RGO39/5/222) | |
| After | 1926 | Moved to Lower record Room (Inventory: RGO39/5/222) | |
| 1932 | Sold to Percy Webster on 1 September (Inventory: RGO39/5/222) |
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