Record

RefNoPT/62/8/54
Previous numbersPT/62/8/5
LevelItem
TitlePhotograph, telescope speculum grinding tool for Lord Rosse's telescope at Birr Castle, Ireland by unknown artist
Date[1861]
DescriptionA front view of the cast iron grinding tool used to produce the speculum of the reflecting telescope at Birr Castle, Parsonstown, Ireland. The face has straight cast grooves forming squares and circular, lathe-cut groves. The tool is shown suspended on gimbals from a pulley. The image is inscribed in pencil, verso 'Original Lord Rosse's paper'. An engraved version of this photograph was published in William Parsons' paper as figure 4 from plate 24.

Subject: Scientific Instruments / Astronomy

Published in Philosophical Transactions as 'On the construction of specula of six-feet aperture; and a selection from the observations of nebulæ made with them'.

Received by the Royal Society on 5 June 1861. Read 20 June 1861.
Extent1p
FormatPhotograph
PhysicalDescriptionAlbumen print, mounted on card
Dimensions104x98mm
AccessStatusOpen
RelatedMaterialDOI: 10.1098/rstl.1861.0029
DOI: 10.1098/rspl.1860.0078
RelatedRecordPT/62/8
URLDescriptionDigital version available on The Royal Society Picture Library
URLhttps://pictures.royalsociety.org/image-rs-9080
Fellows associated with this archive
CodePersonNameDates
NA8084Parsons; William (1800 - 1867); 3rd Earl of Rosse1800 - 1867
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