From:
Bartholomew James Sulivan
To:
Charles Robert Darwin
Date:
12 May 1840
Source of text:
DAR 177: 274
Summary:
Gives CD the results of some calculations for "dip" over different distances, as requested.
Contributor:
Darwin Correspondence Project
Gives CD the results of some calculations for "dip" over different distances, as requested.
No summary available.
Will forward RH's paper to the R.S.L.; intrigued by RH's results using mercury vapor to produce the image on exposed paper.
Just moved [to Collingwood]. Will send information about ED's late son, Thomas Drummond. Recalls Drummond's fame and triangulation work on Irish Survey. Describes invention and first demonstration of Drummond Light.