| Name and Model Number | Mode Frequencies for a Rectangular Plate |
| Country of Origin | England |
| Date of Manufacture | 1972 |
| Front Scales | 9 specialised |
| Back Scales | None |
| Scale Length | 35.2 cm |
| Type of Rule | Slide Rule |
| Construction | Cardboard on Wood |
| Area of Use | Generic |
| Comment | The slide rule can be used to set the rough dimensions of a musical instrument soundboard
so that natural frequencies are spaced in a particular way rather than coincident. |
| Rarity | RRRR |
| Donor | Collection of Patrick Barrington |
| Match Number | 87 |
| 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. |