| Name and Model Number | Kellog Equilibrium Flash Calculator |
| Country of Origin | USA |
| Date of Manufacture | |
| Front Scales | I-VII, f(M,K) =M |
| Back Scales | |
| Scale Length | 10 ins |
| Type of Rule | Slide Chart |
| Construction | Cardboard, plastic cursor |
| Area of Use | Chemical |
| Comment | This is a specialized calculator, which allows process engineers perform equilibrium flash calculations.
MW Kellogg is now KBR, and has a history in developments related to the oil and gas industry industry. |
| Rarity | RR |
| Donor | Collection of Wayne Harrison |
| Match Number | 406 |
| 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. |