| Signature mark | NL 174/3822 |
|---|---|
| Subject | Glasplatte, Negativ |
| Title | Luftströmungen Beschriftet mit: "B.23. a=1,2 mm; Alpha = 34° 30' (?)" |
| Note | Dazugehöriger Brief Ahlborns eingereiht in: NL 174/0618 |
| Duration | 25.03.1902 |
| Further information |
Producer:
Ahlborn, Friedrich
|
| Formal information |
Format (HxB):
9x12 cm |
| Rights notice | CC BY-SA 4.0 |