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APPENDIX A

Published online by Cambridge University Press:  07 September 2010

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Summary

THE USE OF THE DUMPY LEVEL

The Dumpy Level is a revolving telescope with an attached spirit level set up on a tripod and made perfectly horizontal by means of screws. A board marked in metres is held vertically on the spot of which the height is to be ascertained, and the reading is taken through the telescope, the figure read being that cut by the hair stretched horizontally across the eyepiece, which for some reason unknown to me has no reverser so that the figures are read upside down, a trick however to which the eye soon becomes accustomed. The figure thus obtained is the difference in height between the chosen spot and the telescope in that position. Clearly before the reading can have any value the height of the telescope must be found by taking a reading with the board placed on a known fixed mark within range of the operations, to which mark it is best to give an arbitrary height of say ioo m. Then a simple sum in subtraction is all that is necessary: say the reading on the mark A, as in Fig. 4, is 3 m. and the readings on the chosen spots C and D are 4 m. and 4.25 m. respectively, C and D are 1 m. and 1·25 m. respectively below A, and have therefore the arbitrary heights of 99 m. and 98·75 m.

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Publisher: Cambridge University Press
Print publication year: 2010
First published in: 1915

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  • APPENDIX A
  • J. P. Droop
  • Book: Archaeological Excavation
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511731464.009
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  • APPENDIX A
  • J. P. Droop
  • Book: Archaeological Excavation
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511731464.009
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • APPENDIX A
  • J. P. Droop
  • Book: Archaeological Excavation
  • Online publication: 07 September 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511731464.009
Available formats
×