| Name and Model Number | Thornton F5100 Radiation |
| Country of Origin | England |
| Date of Manufacture | |
| Front Scales | 13 specialised |
| Back Scales | 6 specialised |
| Scale Length | 40.9 cm maximum |
| Type of Rule | Slide Rule |
| Construction | Mahogany and Plastic |
| Area of Use | Other |
| Comment | Black Body Radiation |
| Rarity | RR |
| Donor | Collection of Rod Lovett |
| Match Number | 31 |
| Thumbnail |  |
| RR | = Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace. |
| RRR | = Very rare -- only very few known to collectors; may take several years before one comes up for sale. |
| RRRR | = Extremely rare -- a museum piece; unlikely that an example will ever come up for sale. |