Search: Herschel, John in correspondent 
Maclear, Thomas in addressee 
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Showing 81–100 of 161 items

Herschel12118

From:
Sir John Herschel
To:
Thomas Maclear
Date:
3] September [1836
Source of text:
RS:HS 21.209
Summary:

Sends formulae for dealing with the apparent differences, in viewing the comet and compared star, due to the effects of parallax and refraction.

Contributor:
John Herschel Project

Herschel3933

From:
Sir John Herschel
To:
Thomas Maclear
Date:
8] September [1836
Source of text:
unknown
Summary:

Discusses their table of comet stars.

Contributor:
John Herschel Project

Herschel11878

From:
Sir John Herschel
To:
Thomas Maclear
Date:
10] September [1836
Source of text:
RS:HS 12.237
Summary:

Much obliged for F. W. Bessel's zone. Thinks his own extra meridian observations of the comet will be respectable. Feels sure Fearon Fallows could not have approved of the supports of the dome. Has been promised the pleasure of inspecting the expenses of the Observatory. Captain J. E. Alexander and Dr. John Murray will call this morning for a parting cup of tea.

Contributor:
John Herschel Project

Herschel12119

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[19 September 1836]
Source of text:
RS:HS 21.210
Summary:

Calms TM about not having his comet observations published yet; those published so far are not of much value.

Contributor:
John Herschel Project

Herschel3934

From:
Sir John Herschel
To:
Thomas Maclear
Date:
28] September [1836
Source of text:
unknown
Summary:

Wants to reset his barometer by TM's.

Contributor:
John Herschel Project

Herschel3795

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[1836-10]
Source of text:
unknown
Summary:

Asks for TM's barometer and thermometer readings for 20-28 September.

Contributor:
John Herschel Project

Herschel3935

From:
Sir John Herschel
To:
Thomas Maclear
Date:
12] October [1836
Source of text:
unknown
Summary:

Compares JH's and TM's barometric readings. Criticizes Pierre Morin's work.

Contributor:
John Herschel Project

Herschel11733

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[13 October 1836]
Source of text:
RS:HS 12.95 (C: RS:HS 21.212)
Summary:

Reports on JH's actinometer observations. Explains why he subscribed to 'Col. [Harry] Smith's piece of plate.'

Contributor:
John Herschel Project

Herschel3937

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[17 December 1836]
Source of text:
unknown
Summary:

Setting a unit of measurement for solar radiation (the 'actine'); proposes to 'take for a unit of solar heat that which if all employed in heating a cubic inch of water exposing a horizontal surface of one square inch, to a vertical Sun during one minute would produce a dilation of one thousandth part of its volume.'

Contributor:
John Herschel Project

Herschel3938

From:
Sir John Herschel
To:
Thomas Maclear
Date:
20] December [1836
Source of text:
unknown
Summary:

Testing whether an actinometer with a glass back is more accurate than one without.

Contributor:
John Herschel Project

Herschel12121

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[1 February 1837]
Source of text:
RS:HS 21.217
Summary:

Comments on disagreements in stellar observations and on sun spot activity; and requests observations of a specific star.

Contributor:
John Herschel Project

Herschel4010

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[6 February 1837]
Source of text:
unknown
Summary:

Wants to borrow TM's carpenter. Found a faint planetary nebula.

Contributor:
John Herschel Project

Herschel11866

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[13 February 1837]
Source of text:
RS:HS 12.225
Summary:

Cannot send the Brisbane list by the end of the week. Will not expect J. K. Gibbs until the cart is finished. Returns solar spots.

Contributor:
John Herschel Project

Herschel3940

From:
Sir John Herschel
To:
Thomas Maclear
Date:
15] February [1837
Source of text:
unknown
Summary:

Notes discrepancies between TM's and Thomas Brisbane's observations.

Contributor:
John Herschel Project

Herschel3941

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[22 March 1837]
Source of text:
unknown
Summary:

Exhausted from his meteorological observations, JH will not keep his appointment for tomorrow with TM.

Contributor:
John Herschel Project

Herschel3942

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[1837-5]
Source of text:
unknown
Summary:

Asks TM to return JH's book of star magnitudes.

Contributor:
John Herschel Project

Herschel12122

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[5 May 1837]
Source of text:
RS:HS 21.220
Summary:

About the observation of sun spots and the second satellite of Saturn.

Contributor:
John Herschel Project

Herschel12123

From:
Sir John Herschel
To:
Thomas Maclear
Date:
[8 June 1837]
Source of text:
RS:HS 21.222
Summary:

About a variety of observations that JH has made.

Contributor:
John Herschel Project

Herschel3944

From:
Sir John Herschel
To:
Thomas Maclear
Date:
14?] June [1837
Source of text:
unknown
Summary:

Asks TM whether he plans to work today.

Contributor:
John Herschel Project

Herschel3796

From:
Sir John Herschel
To:
Thomas Maclear
Date:
18] June [1837
Source of text:
unknown
Summary:

Feeling very ill. Discusses adjustments to TM's transit instrument.

Contributor:
John Herschel Project
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