GB247606A - Improvements in or relating to optical instruments for measuring distances - Google Patents
Improvements in or relating to optical instruments for measuring distancesInfo
- Publication number
- GB247606A GB247606A GB4311/26A GB431126A GB247606A GB 247606 A GB247606 A GB 247606A GB 4311/26 A GB4311/26 A GB 4311/26A GB 431126 A GB431126 A GB 431126A GB 247606 A GB247606 A GB 247606A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prisms
- distance
- vernier
- field
- difference
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
- G01C3/12—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument with monocular observation at a single point, e.g. coincidence type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/02—Details
Abstract
247,606. Elek, S. Feb. 14, 1925, [Convention date]. Tacheometers.-In order to utilize the telescope of a surveying instrument for distance measuring, two prisms lenses or mirrors are arranged in front of the eye-piece and at an angle to one another so as to divide the field of vision into right and left hand portions, having optical axes with a given difference of level. By this means the distance of the stadia rod from the instrument can be read directly by observing the apparent position of the vernier in one half of the field with reference to the zero position of stadia rod in the other half of the field. In the example utilizing reflecting prisms a, b the rays o from the object glass are reflected from the relatively inclined surfaces, T1, T2, t1, t2 so that they emerge from the two prisms with a difference of level amounting, e.g. to one-hundredth of the focal length of the objective g. In this case, the distance is one hundred times the apparent difference of position of the vernier and zero of the rod. An initial adjustment of the vernier enables the distance to be calculated to the centre of the observing instrument. In other examples, refracting prisms and portions of concave lenses are used to produce the same result.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU247606X | 1925-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB247606A true GB247606A (en) | 1926-07-22 |
Family
ID=10978549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4311/26A Expired GB247606A (en) | 1925-02-14 | 1926-02-15 | Improvements in or relating to optical instruments for measuring distances |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB247606A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2434172A (en) * | 1945-05-02 | 1948-01-06 | Eastman Kodak Co | Inexpensive monobloc range finder |
-
1926
- 1926-02-15 GB GB4311/26A patent/GB247606A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2434172A (en) * | 1945-05-02 | 1948-01-06 | Eastman Kodak Co | Inexpensive monobloc range finder |
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