On Engineering Instruments 10 - Inch Slide Rule Model 250 - BT
Item History & Price
| Reference Number: Avaluer:4649227 | Modified Item: No |
| Country/Region of Manufacture: United States |
Slide rule dates from the early 1960s.
Made by Engineering Instruments, Inc. of Peru, Indiana. Production ran from 1947 to 1967.
Although it shows some slight yellowing due to its age, the rule's numbers and symbols are sharp and clear. The plastic slide is still clear and slides easily over the rule. The inner slide is still tight with no wiggles or extra play, and on its flip side are three more scales.
The down side: The original cardboard sheath has been torn off at ...the top end and shows the results of careless use, especially on the edges. None of that affects the slide rule itself.
Various useful conversion tables are on the back of the tool.
Made by Engineering Instruments, Inc. of Peru, Indiana. Production ran from 1947 to 1967.
Although it shows some slight yellowing due to its age, the rule's numbers and symbols are sharp and clear. The plastic slide is still clear and slides easily over the rule. The inner slide is still tight with no wiggles or extra play, and on its flip side are three more scales.
The down side: The original cardboard sheath has been torn off at ...the top end and shows the results of careless use, especially on the edges. None of that affects the slide rule itself.
Various useful conversion tables are on the back of the tool.
