DE45593C - Centrir device for theodolites - Google Patents
Centrir device for theodolitesInfo
- Publication number
- DE45593C DE45593C DENDAT45593D DE45593DA DE45593C DE 45593 C DE45593 C DE 45593C DE NDAT45593 D DENDAT45593 D DE NDAT45593D DE 45593D A DE45593D A DE 45593DA DE 45593 C DE45593 C DE 45593C
- Authority
- DE
- Germany
- Prior art keywords
- centrir
- theodolites
- theodolite
- ocular
- vertical axis
- 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
- 241000238633 Odonata Species 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Eye Examination Apparatus (AREA)
Description
Die nachstehend beschriebene Centrireinrichtung soll dazu dienen, einen Theodoliten genau über einem gegebenen Punkt aufzustellen. Dieselbe besteht im wesentlichen aus einem gebrochenen Fernröhrchen, welches zum Theil in der Verticalachse enthalten ist und dessen •Visirlinie senkrecht nach unten gerichtet ist.The centrir device described below is intended to accurately measure a theodolite to be placed over a given point. It consists essentially of a broken one Telescope, which is partly contained in the vertical axis, and its • Line of sight is directed vertically downwards.
Die Einzelheiten der Ausführung sind aus der Zeichnung ersichtlich. Die Verticalachse V des Theodoliten, die Tragfeder F und die Verschlufskappe K sind centrisch durchbohrt. In das untere Ende der Achse V ist ein achromatisches Objectiv O eingesetzt und vor dem oberen Ende ein Glasprisma P angebracht. Um für dasselbe Raum zu schaffen, ist zwischen die Alhidade A und den Fernrohrträger T ein kastenförmiges GufsstUck Z eingeschaltet, an welchem auch der Oculartheil des Centrirfernröhrchens befestigt ist. Die Mittellinie des Ocularauszugrohres R fällt mit der Richtung p-q zusammen, in welcher ein senkrecht von unten kommender centraler Strahl durch das Prisma P abgelenkt wird. In einer Erweiterung des Auszugrohres sitzt die Fädenblende B, die durch Justirschrauben so verschoben werden kann, dafs der Schnittpunkt der Fäden in die.Linie p-q fällt. Vor dem Fadenkreuz befindet sich ein gewöhnliches Ramsden'sches Ocular CThe details of the execution can be seen from the drawing. The vertical axis V of the theodolite, the suspension spring F and the closure cap K are pierced centrically. An achromatic objective O is inserted into the lower end of the axis V and a glass prism P is attached in front of the upper end. In order to create space for the same, a box-shaped cast Z is inserted between the alidade A and the telescope carrier T , to which the ocular part of the centric tube is also attached. The center line of the ocular extension tube R coincides with the direction pq , in which a central ray coming vertically from below is deflected by the prism P. In an extension of the extension tube sits the thread diaphragm B, which can be moved by adjusting screws so that the intersection of the threads falls into the line pq. There is an ordinary Ramsden's Ocular C in front of the crosshair
Bei richtiger Justirung der Vorrichtung kann ein Beobachter, der bei q in das Ocular blickt, nur solche Objecte im Schnittpunkt der Fäden sehen, welche in der Verlängerung der Verticalachse des Theodoliten liegen. Ein derartig eingerichteter Theodolit läfst sich daher sehr leicht genau über einem gegebenen Punkt aufstellen, indem man ihn auf einer nahezu horizontalen Stativplatte verschiebt, bis der Schnittpunkt der Faden des Centrirfernröhrchens den betreffenden Punkt deckt. Selbstverstündlich mufs dabei die senkrechte Lage der Veriicalachse mit Hülfe von Libellen wie gewöhnlich hergestellt und erhalten werden.When the device is properly adjusted, an observer who looks into the ocular at q can only see objects at the intersection of the threads which lie in the extension of the vertical axis of the theodolite. A theodolite set up in this way can therefore very easily be set up exactly over a given point by moving it on an almost horizontal tripod plate until the intersection of the threads of the centrirfer tube covers the point in question. It goes without saying that the vertical position of the verical axis must be established and maintained with the help of dragonflies as usual.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
DE45593C true DE45593C (en) | 1900-01-01 |
Family
ID=320752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT45593D Expired DE45593C (en) | Centrir device for theodolites |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE45593C (en) |
-
0
- DE DENDAT45593D patent/DE45593C/en not_active Expired
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