Graphs, variation in chemical diffused light and daily changes in chemical luminosity by unknown artist

Description

Plate 46, figures 11-12 showing two graphs. The first graph shows the hourly variation in chemical diffused light on equinox at numerous locations including Cairo [Egypt], Naples [Italy], Heidelberg [Germany], Manchester [England], Petersburg [St Petersburg, Russia], Reykjavik [Iceland], and Melville Island [Northwest Territories, Nunavut, Canada]. The second shows the daily changes of chemical luminosity in a sky with passing clouds. Inscribed with publication and plate details. Not signed. The manuscript for this paper is wanting.

Subject: Physics / Chemistry

Published in Philosophical Transactions as part of paper titled 'Photo-chemical researches.—Part IV' by Robert Wilhelm Bunsen and Henry Enfield Roscoe.

Received and read by the Royal Society on 26 May 1859.

Reference number

PT/75/8/30

Earliest possible date

1859

Physical description

Ink on graph paper

Page extent

1 page

Format

Diagram