Spark discharge figure
Date
1892
Object type
Archive reference number
Material
Dimensions
height (drawing): 99mm
width (drawing): 116mm
width (drawing): 116mm
Subject
Description
Diagram created by sparking from Lord Armstrong’s machine for producing high tension electricity. These patterns were made in a powder of magnesium oxide (‘calcined magnesia’) and carbon black. The images were then photographed and drawings produced from them.
The author states in his paper that: ‘No.9 is the same as No.7, except that the conducting wires are brought down upon the card at a steep angle’.
Illustration from the manuscript version of the paper ‘On a multiple induction machine for producing high tension electricity, and on some remarkable results obtained with it’, by Lord Armstrong, Proceedings of the Royal Society, vol.52 (1892), pp.176-191. Printed as figure 9 plate 7 in the published paper.
The image is inscribed below in ink: ‘No.IX’ and in pencil ‘7/20’. Imprint details verso.
William George Armstrong, Baron Armstrong (1810-1900) armaments manufacturer and industrialist was elected a Fellow of the Royal Society in 1846.
The author states in his paper that: ‘No.9 is the same as No.7, except that the conducting wires are brought down upon the card at a steep angle’.
Illustration from the manuscript version of the paper ‘On a multiple induction machine for producing high tension electricity, and on some remarkable results obtained with it’, by Lord Armstrong, Proceedings of the Royal Society, vol.52 (1892), pp.176-191. Printed as figure 9 plate 7 in the published paper.
The image is inscribed below in ink: ‘No.IX’ and in pencil ‘7/20’. Imprint details verso.
William George Armstrong, Baron Armstrong (1810-1900) armaments manufacturer and industrialist was elected a Fellow of the Royal Society in 1846.
Associated place