# Picket Model 1000 Slide Rule

### Title

Picket Model 1000 Slide Rule

### Subject

Mathematics

### Description

Physical Description: The Pickett 1000 slide rule is made of three rectangular bars of aluminum alloy coated in plastic with grooved slides. Two bars are connected at the end with braces that are mounted to the flat side of the bars and the third bar is free to slide between them, held in place by slide tension springs. The two outer bars are called stators and the inner bar is referred to as the slide. The slide rule also has a courser made of two flat lenses held together by aluminum above and below the upper and lower stators. Each bar of the Pickett 1000 slide rule has at least one scale on it. The front side of the slide rule has the DF scale on the upper stator CF, CIF, CI and C scales on the slide and D and L scales on the lower stator. The back side of the slide rule has an A scale in the top stator B, T, ST, and S scales on the slide and K and D scales on the lower stator.

Functional Description: Slide rules work on a system of logarithms. In order to do multiplication the slide rule adds two logarithms and takes the antilog to determine the answer. Because the slide rule uses logarithmic scales, the operation is simplified. If the user wanted to multiply two numbers together they would move one of the indices on the C scale to the first number that they wish to multiply on the D scale .They would then move the cursor to the second number in the multiplication on the C scale and look at the corresponding number on the D scale. So, if you wanted to multiply 2 and 4 you would move the left index of the C scale to the 2 on the D scale, move the cursor to the 4 on the C scale and see that the answer Is 8. To do division the inverse is done. To find the square and square root the A or B scale and the D scale are used. Locate the number of the square root you want to find using the cursor, when found the corresponding number on the D scale is the answer. To find the square the inverse is found. cube and cube root K scale and the D scale are used. To find the cube root take the number and find it on the K scale read the corresponding number on the D scale. To find the cube the inverse is performed. Scales available on the slide C and D used for multiplication and Division, CF and DF used for multiplication and division when the C and D scales run out. The CI and CIF scales are the inverse of the C scale and CF scale respectively. The S T slides are used for sine and tangent of greater than 5.7 degrees while the ST slide is used for degrees less than 5.7 degrees. The A and B scales are used in the calculation of squares and square roots. The L scale is used for the Log base 10 of a number..

### Creator

Trevor Cretney, Adam Kausch, Matthew Luebke, and Adam Miller

### Source

International Slide Rule Museum. ISRM is the world's largest free digital repository of all things concerning slide rules and other math artifacts. There are over 7000 Images or PDF's in the ISRM Galleries">. Web. 22 Mar. 2017. <http://sliderulemuseum.com/SR_Scales.htm>.

Konshak, Mike. Pickett Chronology. JPG.

Hartung, Maurice L. How to use the Ortho-phase duplex slide rule. Pickett & Eckel, 1948. PDF.

Konshak, Mike. Pickett Chronology. JPG.

Hartung, Maurice L. How to use the Ortho-phase duplex slide rule. Pickett & Eckel, 1948. PDF.

### Date

1957

### Language

English

### Type

physical object

### Coverage

United States

### Physical Dimensions

Body: 31 x 306 x 7 mm

Slide: 306 x 14 x 3 mm

Cursor: 25 x 41 x 7 mm

Slide: 306 x 14 x 3 mm

Cursor: 25 x 41 x 7 mm

### Materials

Aluminum, Plastic

### Maker

Pickett & Eckel Inc, Alhambra, CA

### Inscriptions

U.S.A. COPYRIGHT 1948 | PICKETT. A.F. ECKEL | ALHAMBRA. CALIF., U.S.A. [front face, left side of slide]

PICKETT & ECKEL INC. | ALHAMBRA CALIF U.S.A. [front face right side of slide]

MODEL NO. 1000 | ORTHO – PHASE DUPLEX [back face left side of slide]

‘Pickett logo’ [back face right side of slide]

D204318 [cursor]

PICKETT & ECKEL INC. | ALHAMBRA CALIF U.S.A. [front face right side of slide]

MODEL NO. 1000 | ORTHO – PHASE DUPLEX [back face left side of slide]

‘Pickett logo’ [back face right side of slide]

D204318 [cursor]

Scales

A: 1-20 logarithmic scale

B: 1-20 logarithmic scale

T: logarithmic scale from 0-90

ST: logarithmic scale 0.56-5.73

S: logarithmic scale from 0-90

K: 1-30 logarithmic scale

D: 1-10 logarithmic scale with notation at pi

DF: folded scale ranging from pi-10 and then 1-pi

CF: folded scale ranging from pi-10 and then 1-pi

CIF: descending logarithmic scale pi-1 followed by 10-pi

CI: descending logarithmic scale 10-1

C: 1-10 logarithmic scale with notation for pi

L: 1-10 linear scale

### History of the Object

The history of this object at Michigan Tech is unknown. It is a calculation tool used before the calculator became an affordable tool.

### Location

Alumni House

### Bibliography

*Pickett*. Slide Rule Museum. Accessed March 03, 2017. http://sliderulemuseum.com/Pickett.htm.

### Files

### Collection

### Citation

Trevor Cretney, Adam Kausch, Matthew Luebke, and Adam Miller, “Picket Model 1000 Slide Rule,”

*Michigan Tech Inventory of Historic Scientific Instruments*, accessed October 19, 2017, http://ihsi.omeka.net/items/show/11.