| Name and Model Number | K&E 4019A Goodchild Slide Rule with Chart |
| Country of Origin | USA |
| Date of Manufacture | c.1903 - 1906 (from catalog dates) |
| Front Scales | 100 scale sections in gridiron format. |
| Back Scales | Trig. |
| Scale Length | 16.5-m |
| Type of Rule | Slide Rule |
| Construction | Scales printed on 18-cm x 23-cm card stock glued to plywood board. With special boxwood slide rule. Slide rule is triangular in cross section. It is 34-cm long & the 3 faces are 2.2-cm wide. One face has a slide and has gradation marks running from 0 to 100 in equal spaces. The other two faces have short slides that indicate positions along the rule. |
| Area of Use | Technical |
| Comment | Gridiron graphical table form of slide rule. Instructions are on the reverse. The triangular rule is used to make calculations along the chart scales. Copyrighted Sept., 1893 by C.W. Goodchild. The chart shown is a reproduction of the only known example. It is in the collection of the MIT Museum. The Goodchild slide rule is in my collection. It is used to make calculations along the chart. |
| Rarity | RRRR |
| Donor | Collection of Ed Chamberlain |
| Match Number | 148 |
| 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. |