Article | Published:

Single Spark Photography and its Application to some Problems in Ballistics

Subjects

Abstract

SPARK photography, in which the illumination is provided by an electric spark of such short duration that a moving object appears stationary, has many applications in the investigation of high-speed phenomena. The record obtained is not an image, no lens being used, but is simply the silhouette of objects between the light source and the photographic plate. Two distinct problems are presented in the photography of moving objects. One of these is the timing of the spark so that the desired epoch of the phenomenon under investigation may be photographed, and the other has to do with the duration of the spark. All the photographs described in this article were taken on plates not larger than 8 by 10 inches. A projectile moving at a speed of 2700 feet per second would be in front of such a plate, and therefore in a position to be photographed, for only 0.0003 second. If the projectile is to be photographed within an inch of a predetermined position, the time of occurrence of the spark must be correlated with the position of the projectile to within 0.00006 second.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

BIBLIOGRAPHY: The following references make no pretence at completeness, but those interested may find the list of interest.

  1. 1

    C. V. Boys, NATURE, vol. 147, pp. 415 and 440, 1893.

  2. 2

    Cranz & Glatzel, Verh. d. Deutsch. Phys. Ges. vol. 14, pp. 525–535, 1912.

  3. 3

    "Encyklopädie der Photographie," vol. 29.

  4. 4

    "Encyklopädie der Photographie," vol. 12.

  5. 5

    C. Cranz, "Lehrbuch der Ballistik," III.

  6. 6

    U.S.N. Ordnance Pamphlet, No. 422, by W. A. Hyde .

  7. 7

    Quayle, Journ. Frankl. Inst. vol. 193, pp. 627–640, 1922.

  8. 8

    C. V. Boys, Photographic Journal, vol. 16, pp. 19–209, 1891–92.

Download references

Author information

Rights and permissions

To obtain permission to re-use content from this article visit RightsLink.

About this article

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.