  The Carrington storm in 1859 September has been arguably identified as the
greatest geomagnetic storm ever recorded. However, its exact magnitude and
chronology remain controversial, while their source data have been derived from
the Colaba H magnetometer. Here, we have located the Colaba 1859 yearbook,
containing hourly measurements and spot measurements. We have reconstructed the
Colaba geomagnetic disturbances in the horizontal component ({\Delta}H), the
eastward component ({\Delta}Y), and the vertical component ({\Delta}Z) around
the time of the Carrington storm. On their basis, we have chronologically
revised the ICME transit time as =< 17.1 hrs and located the {\Delta}H peak at
06:20 -- 06:25 UT, revealing a magnitude discrepancy between the hourly and
spot measurements (-1691 nT vs. -1263 nT). Furthermore, we have newly derived
the time series of {\Delta}Y and {\Delta}Z, which peaked at {\Delta}Y ~ 378 nT
(05:50 UT) and 377 nT (06:25 UT), and {\Delta}Z ~ -173 nT (06:40 UT). We have
also computed the hourly averages and removed the solar quiet (Sq) field
variations from each geomagnetic component to derive their hourly variations
with latitudinal weighting. Our calculations have resulted in the disturbance
variations (Dist) with latitudinal weighting of Dist Y ~ 328 nT and Dist Z ~
-36 nT, and three scenarios of Dist H ~ -918, -979, and -949 nT, which also
approximate the minimum Dst. These data may suggest preconditioning of the
geomagnetic field after the August storm ({\Delta}H =< -570 nT), which made the
September storm even more geoeffective.
