| Name and Model Number | Edward Roberts six-slide Everard |
| Country of Origin | England |
| Date of Manufacture | ~1765 |
| Front Scales | See comment section |
| Back Scales | See comment section |
| Scale Length | 12" |
| Type of Rule | Everard |
| Construction | Boxwood |
| Area of Use | Gauging |
| Comment | Four of the scale sets are traditional to four-sided Everard rules.
The traditionally narrow faces of a four-slide are the wide faces in this example because of the addition second slides to both of these faces. Both additional slides have single decade 1 - 10 logarithmic scales on both edges. The upper edge of the rule body is also a single decade logarithmic scale. Possibly a special order Everard with the added scales designed to facilitate basic multiplication and division. |
| Rarity | RRRR |
| Donor | Collection of an English gentleman |
| Match Number | 93 |
| 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. |