Optical Instruments

1. Patents (1860-1982)
2. Plans (1889-1976)
3. Negatives 1059-1078 (1895-1964)
4. Negatives 1079-1096 (1895-1964)
5. Negatives 1097-1129 (1895-1964)
6. Negatives 1130-1144 (1895-1964)
7. Negatives 1145-1162 (1895-1964)
8. Negatives 1164-1180 (1895-1964)
9. Negatives 1181-1195 (1895-1964)
10. Negatives 1208-1215 (1895-1964)
11. Negatives 1217-1232 (1895-1964)
12. Negatives 1233-1247 (1895-1964)
13. Negatives 188-205 (1895-1964)
14. Negatives 206-239 (1895-1964)
15. Negatives 1280-1296 (1895-1964)
16. Negatives 1297-1327 (1895-1964)
17. Negatives 1332-1349 (1895-1964)
18. Negatives 1350-1396 (1895-1964)
19. Negatives 1397-1414 (1895-1964)
20. Negatives 1435-1457 (1895-1964)
21. Negatives 1460-1489 (1895-1964)
22. Negatives (1895-1964)
23. Negatives 1265-1278 (1895-1964)
24. Negatives 305-351 (1895-1964)
25. Negatives 352-377 (1895-1964)
26. Negatives 378-397 (1895-1964)
27. Negatives 400-434 (1895-1964)
28. Negatives 438-460 (1895-1964)
29. Negatives 529-568 (1895-1964)
30. Negatives 569-590 (1895-1964)
31. Negatives 592-607 (1895-1964)
32. Negatives 687-701 (1895-1964)
33. Negatives 735-758 (1895-1964)
34. Negatives 816-864 (1895-1964)
35. Negatives 893-905 (1895-1964)
36. Negatives 928-952 (1895-1964)
37. Negatives 976-988 (1895-1964)
38. Photographs (1900-1964)
39. Design Specifications (1910-1959)
40. Negative of tripod MH31 (1913-1977)
41. Negative of tripod MH31 (1913-1977)
42. Negative of single order receiver RE5 (1913-1977)
43. Negative of single order transmitter TG3 (1913-1977)
44. Negative of coincidence illustration (1913-1977)
45. Negative of heightfinder UB1 (1913-1977)
46. Negative of heightfinder UB1 (1913-1977)
47. Negative of heightfinder UB1 (1913-1977)
48. Negative of experimental built up pentagonals (1913-1977)
49. Negative of heightfinder UB1 (1913-1977)
50. Negative of porcupine drums (1913-1977)

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