Identity area
Reference code
Title
Date(s)
- 02-04-1919 (Creation)
Level of description
Extent and medium
1 laminated sheet
Context area
Name of creator
Biographical history
John Evershed (1864-1956) was an English astronomer who, in 1909, discovered the horizontal motion of gases outward from the centres of sunspots, a phenomenon sometimes called the Evershed effect. In 1906, Evershed became assistant director of the Kodaikanal and Madras observatories in India, later becoming director. Evershed retired in 1923, returning to England; in 1925, he built his own solar observatory at Ewhurst.
Repository
Archival history
The documents were transferred from Kodaikanal Solar Observatory to IIA Archives
Immediate source of acquisition or transfer
The documents were acquired from Kodaikanal Solar Observatory
Content and structure area
Scope and content
This letter was sent to the officer in charge of Survey of India, Dehradun, from John Evershed, stating that the suspension needed to be more satisfactory in the declination magnetograph. He also requested arrangements to supply two spare mirrors for the galvanometer and half dozen flexible axes for rotating the earth inductor coil, which would be paid from the contingent account.
Appraisal, destruction and scheduling
The documents were transferred to the IIA archives and have been preserved
Accruals
Further accruals are expected
System of arrangement
Arranged chronologically according to the year of events
Conditions of access and use area
Conditions governing access
Researchers must sign IIA Archival access agreement
Conditions governing reproduction
Copyright is retained by IIA Archives
Language of material
English
Script of material
Latin
Language and script notes
The document is in English
Physical characteristics and technical requirements
The document is in good condition, and the texts are clear and readable
Finding aids
Allied materials area
Existence and location of originals
The originals were located in the Kodaikanal Solar Observatory
Existence and location of copies
The original files are transferred to Bangalore campus, then processed and archived
Related units of description
Notes area
Note
Digitized and made available online in IIA Institutional Repository
Alternative identifier(s)
Access points
Subject access points
Place access points
Name access points
- Evershed, John (Subject)
Genre access points
Description control area
Description identifier
Institution identifier
Rules and/or conventions used
Archival description is based on ISAD(G), second edition.
Status
Level of detail
Dates of creation revision deletion
Language(s)
English
Script(s)
Latin
Sources
Archivist's note
Processed by IIA Archives