| Manufacturer: |
Keuffel and Esser |
| Country of Manufacture: |
U.S.A. |
| Type: |
Thacher 4012 Cylindrical (Type 2) |
| Number: |
4084 |
| Date of Manufacture: |
~1920 |
| Scales: (Front) |
20 Axial Rib Segments (B and C scales) |
| Scales: (Back) |
Rotating Inner Cylinder (the A scale) |
| Number of Scales: |
|
| Gauge Points: |
|
| Slide Rule made from: |
Brass on a mahogany base with varnished paper mache scales |
| Cursor made from: |
|
| Cursor Lines: |
|
| Overall Length of Rule: |
22 1/2" |
| Length of Scales: |
18" long. Outer cylinder 6" diameter. Effective length of scales 30' |
| Width: |
Inner cylinder 4" in diameter |
| Depth: |
|
| Weight: |
|
| Acquired from: |
Kris Hardy (Station House Antiques) |
| Date: |
Jul 2001 |
| Condition: |
Good |
| Accessories: |
Box 24" x 6 5/8" x 6 3/8". Good condition
|
| Comments: |
The number on paper in the case is 5095
which would seem to indicate that the rule
and the case were not originally together
|