DOI Page / Citation link:
https://doi.org/10.11588/diglit.20132#0085
calculation of barometric heig-hts.
55
4. MATERIALS FOR THE DAILY PERIOD.
The variation of the resulting height with the daily period is very consider-
able for climates having a large daily range of temperature. We had, however,
greater facilities for defining the amount of these variations than in the calculation
of the yearly period. From a numerous collection of such observations we select
six series, which will be quite sufficient for deducing the corrections required.
We of course define the variation within the daily period as the difference of the
respective hour, not from the yearly or corrected mean, but from the monthly
mean of the 24 hours. At all the different stations, the hours of direct observations
included the period from 6h a.m. to 10h p.m. The respective elements for the night
(at midnight, 2h a.m., and 411 a.m.) had to be calculated by a formula of interpolation,
which will be used, and communicated in detail, in the volume treating of the special
objects of meteorology.1
Though considerably increasing the labour of calculation, we found it the better
plan first to deduce by interpolation the respective meteorological elements, and then
to proceed with calculating the height for the hours of the night, as we give them
in the curves.
We present the following series:
A. FOR INDIA.
1. Ambala — Agra, mean for the month of December, 1854. These curves are
intended as the type of Hindostan.
2. Puna —Bombay, from Adolphe's observations taken from December 29, 1854,
to January 5, 1855, near the dak bangalo. To reduce the results to the door-way
of the dak bangalo, a local correction of — 15 feet had to be applied.
3. Ka.la.dghi — Bombay, from our observations, January 17—20, 1855. They refer
to the door-way of the travellers' bangalo.
4. Sager — Agra, from Eobert's observations, December 14—18, 1855, referred
to the door-way of the travellers' bangalo. The local correction of ■— 5 feet is applied
to the results.
1 For the present we refer to our "Neue Untersuchungen iiber die Alpen," p. 384, et seq.
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55
4. MATERIALS FOR THE DAILY PERIOD.
The variation of the resulting height with the daily period is very consider-
able for climates having a large daily range of temperature. We had, however,
greater facilities for defining the amount of these variations than in the calculation
of the yearly period. From a numerous collection of such observations we select
six series, which will be quite sufficient for deducing the corrections required.
We of course define the variation within the daily period as the difference of the
respective hour, not from the yearly or corrected mean, but from the monthly
mean of the 24 hours. At all the different stations, the hours of direct observations
included the period from 6h a.m. to 10h p.m. The respective elements for the night
(at midnight, 2h a.m., and 411 a.m.) had to be calculated by a formula of interpolation,
which will be used, and communicated in detail, in the volume treating of the special
objects of meteorology.1
Though considerably increasing the labour of calculation, we found it the better
plan first to deduce by interpolation the respective meteorological elements, and then
to proceed with calculating the height for the hours of the night, as we give them
in the curves.
We present the following series:
A. FOR INDIA.
1. Ambala — Agra, mean for the month of December, 1854. These curves are
intended as the type of Hindostan.
2. Puna —Bombay, from Adolphe's observations taken from December 29, 1854,
to January 5, 1855, near the dak bangalo. To reduce the results to the door-way
of the dak bangalo, a local correction of — 15 feet had to be applied.
3. Ka.la.dghi — Bombay, from our observations, January 17—20, 1855. They refer
to the door-way of the travellers' bangalo.
4. Sager — Agra, from Eobert's observations, December 14—18, 1855, referred
to the door-way of the travellers' bangalo. The local correction of ■— 5 feet is applied
to the results.
1 For the present we refer to our "Neue Untersuchungen iiber die Alpen," p. 384, et seq.
■