| Name and Model Number | Richmond Improved Milk Scale Baird & Tatlock, London |
| Country of Origin | England |
| Date of Manufacture | unknown |
| Front Scales | Temperature, Fat | Specific Gravity Lactometer Reading | Total Solids |
| Back Scales | None (equation T=.25G+1.2F+.14 on back along with a hand created Celsius to Fahrenheit conversion chart) |
| Scale Length | 12" (30 cm) |
| Type of Rule | Slide Rule |
| Construction | Boxwood |
| Area of Use | Other |
| Comment | For milk calculations. |
| Rarity | RR |
| Donor | Collection of Louis J. Gotlib, USA |
| Match Number | 23 |
| Thumbnail (Click Picture for Details) |  |
| In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen |
| (1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD. |
| • RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace. |
| • RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale. |
| • RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale. |