![](https://coimages.sciencemuseumgroup.org.uk/375/636/large_thumbnail_1928_0920__0001_.jpg)
Concave iron block with crystal quartz attached
![Concave iron block to which 18 pieces of rock crystal (quartz)](https://coimages.sciencemuseumgroup.org.uk/323/375/medium_smg00032178.jpg)
Concave iron block to which 18 pieces of rock crystal (quartz) are stuck by means of pitch ready for grinding and polishing
Details
- Category:
- Optics
- Object Number:
- 1938-128
- Materials:
- steel (metal), pitch and quartz
- Measurements:
-
overall: 100 mm x x , 245 mm, 3.74kg
- type:
- block
- credit:
- Brice, E.T.