DE225422C - - Google Patents
Info
- Publication number
- DE225422C DE225422C DENDAT225422D DE225422DA DE225422C DE 225422 C DE225422 C DE 225422C DE NDAT225422 D DENDAT225422 D DE NDAT225422D DE 225422D A DE225422D A DE 225422DA DE 225422 C DE225422 C DE 225422C
- Authority
- DE
- Germany
- Prior art keywords
- needle
- base plate
- glass
- micrometer
- compass
- 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.)
- Active
Links
- 239000011521 glass Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 2
- 241000182341 Cubitermes group Species 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/02—Magnetic compasses
- G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
- G01C17/10—Comparing observed direction with north indication
- G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE225422C true DE225422C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=486066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT225422D Active DE225422C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE225422C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3193944A (en) * | 1962-08-24 | 1965-07-13 | John L Marrotte | Magnetic compass for aircraft |
-
0
- DE DENDAT225422D patent/DE225422C/de active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3193944A (en) * | 1962-08-24 | 1965-07-13 | John L Marrotte | Magnetic compass for aircraft |
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