GB190801925A - Improvements in Levels to be used for Ascertaining Vertical Angles. - Google Patents
Improvements in Levels to be used for Ascertaining Vertical Angles.Info
- Publication number
- GB190801925A GB190801925A GB190801925DA GB190801925A GB 190801925 A GB190801925 A GB 190801925A GB 190801925D A GB190801925D A GB 190801925DA GB 190801925 A GB190801925 A GB 190801925A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bubble
- eyepiece
- levels
- ascertaining
- sighted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Lenses (AREA)
- Telescopes (AREA)
Abstract
1925. Williams, A. C. Jan. 28. Clinometers.-In levels of the Abney type in which the reference bubble is projected into the field of view, the telescope eyepiece is provided with one or more half-lenses of high magnifying power through which the object is sighted, and with a half spectacle lens for viewing the bubble. The eyepiece 11 is arranged to slide in the body. 1 of the instrument and is provided with half-lenses 11<a>, 11<b>, the object being sighted through prisms 4, 5 and the object-glass 10. The bubble of the spirit level 6 is observed by reflection from a mirror 13 through a half-lens 12 mounted in the eyepiece. The spirit level is mounted on a carrier 7 pivoted at 8, and is moved by means of a micrometer screw 9 gearing with a segment 7<a>. The angle through which the level has been moved to bring the bubble to its central position is read by means of a degree scale 15, minutes being read on the head 17 of the screw, or by a vernier.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190801925T | 1908-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190801925A true GB190801925A (en) | 1908-10-15 |
Family
ID=32207205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190801925D Expired GB190801925A (en) | 1908-01-28 | 1908-01-28 | Improvements in Levels to be used for Ascertaining Vertical Angles. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190801925A (en) |
-
1908
- 1908-01-28 GB GB190801925D patent/GB190801925A/en not_active Expired
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