| Name and Model Number | Hawthorn presentation rule |
| Country of Origin | UK |
| Date of Manufacture | c1840 |
| Front Scales | Routledge variant |
| Back Scales | Tables of “Extreme Strain” and “Measures” |
| Scale Length | 11” |
| Type of Rule | Other |
| Construction | Boxwood & German silver |
| Area of Use | Other |
| Comment | 2-foot, 2-fold used for steam engine design.
These particular variants of Hawthorn’s rule appear to be especially made with added embellishment in ivory and German silver as presentation rules to a particular dignitary, this one to “Robt. Hawthorn Snr. Walbottle” the inventor. A number of examples are known, all have been made by John B. Morris of London (fl 1825 – 1843) of who little is known. Some ivory bits are missing, whether you think this an improvement or prefer the simple design of the standard is up to you. |
| Rarity | RRR |
| Donor | Collection of an English gentleman |
| Match Number | 55 |
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| 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. |