Spark discharge figure
Date
1892
Object type
Archive reference number
Material
Dimensions
height (drawing): 86mm
width (drawing): 109mm
width (drawing): 109mm
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.2 may be regarded as a transverse section of No.1, being produced by similar sparks delivered vertically through a hole in the dust plate when fixed horizontally midway between the sparking points. It shows that the discharge is surrounded by circular lines in the transverse as well as the longitudinal direction’.
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 2 plate 3 in the published paper.
The image is inscribed below in ink and pencil: ‘No.2’ over and erasure of ‘II’ and in pencil ‘4/10’. 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.2 may be regarded as a transverse section of No.1, being produced by similar sparks delivered vertically through a hole in the dust plate when fixed horizontally midway between the sparking points. It shows that the discharge is surrounded by circular lines in the transverse as well as the longitudinal direction’.
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 2 plate 3 in the published paper.
The image is inscribed below in ink and pencil: ‘No.2’ over and erasure of ‘II’ and in pencil ‘4/10’. 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