![](https://coimages.sciencemuseumgroup.org.uk/30/666/large_thumbnail_1928_0945__0002_.jpg)
Holtz 'restricted ray' vacuum tube
![Holtz 'restricted ray' vacuum tube, simple pattern](https://coimages.sciencemuseumgroup.org.uk/460/959/medium_smg00231892.jpg)
Holtz 'restricted ray' vacuum tube, simple pattern, probably made in Germany
Details
- Category:
- Electricity and Magnetism
- Object Number:
- 1974-412/31
- type:
- vacuum tube
- credit:
- Leyton High School
Holtz 'restricted ray' vacuum tube, simple pattern, probably made in Germany