Pickett Vector Dual Base Log Log slide rule, with Twin Pack accessories
Date: copyright 1959
Inventory Number: 1991-4-0004a
Classification: Slide Rule
Subject:
Maker: Pickett & Eckel, Inc. (1943-1985)
Seller: Lowell Technological Institute (1895-1991)
Cultural Region:
Place of Origin:
City of Use:
Dimensions:
slide rule: 6.5 × 30.9 × 0.9 cm (2 9/16 × 12 3/16 × 3/8 in.)
case: 8.1 × 32.9 × 2.2 cm (3 3/16 × 12 15/16 × 7/8 in.)
Accessories: brown leather case with hard plastic lining and flap closure; small plastic bag; Twin Pack box; 3 instruction manuals (in file); belt loop (1991-4-0004b); pocket slide rule (1991-4-0004c); cardboard box
DescriptionRectangular aluminum rule with three slides, faced with yellow enamel. The top and bottom slides are bolted to horseshoe-shaped aluminum pieces at both ends on both sides. The center slide moves to left and right. It has a small circular hole near each end. A clear plastic cursor bolted to a clear plastic frame also slides to left and right.
Fifteen scales are printed on the face of the slide rule. Near the top of the top, fixed slide is a logarithmic "[square root]" scale carrying values from 1 to 2.15. "DIGITS 1-4-7-10 ETC." is printed directly to the left of this scale. Below this are two logarithmic scales sharing the same baseline, both labeled "[cube root]". These have values ranging from 2.15 to 4.65 (top) and from 4.65 to 10 (bottom). To the left of the scales are: "DIGITS 2-5-8-11 ETC." (top) and "DIGITS 3-6-9-12 ETC." (bottom).
Printed along the bottom edge of the top, fixed slide is a logarithmic "DF" scale, which has values that wrap around from [pi] to 10, then from 1 to [pi]. An identical "CF" scale is printed along the top edge of the center, moveable slide.
Printed in red second from the top along the center, moveable slide is an inverted logarithmic scale "CIF". To the left of each of its values, which descend from 3.2 to 1, then from 10 to 3.2, is a sideways chevron. Printed below this are two T scales sharing a baseline. The top scale has values ranging from from 5.7 to 45; the bottom scale has values ranging from 45 to 84.3. Fifth and sixth from the top, respectively, are "ST and "S" scales sharing a baseline. The "ST" scale has values ranging from .57 to 5.7. The "S" scale has two sets of values. The set printed in black ascends from 5.7 to 90. The set printed in red, with a sideways chevron to the left of each number, descends from 84.3 to 0. Below the "S" scale, printed in red with a sideways chevron to the left of each value, is an inverted logarithmic scale "CI". It has values descending from 10 to 1.
Printed along the bottom edge of the center slide is a logarithmic scale "C" carrying values from 1 to 10. An identical scale "D" is printed along the top edge of the bottom, fixed slide. Below the "D" scale is a "DI" scale identical to the "CI" scale above.
Printed near the bottom of the bottom slide are two logarithmic scales sharing a baseline. These are labeled "[root]"; "000 {DIGIT / ZERO} NOS." is printed directly to their left. The top scale has values ranging from 1 to 3.17; the bottom scale has values ranging from 3.16 to 10.
Seventeen scales are printed on the back of the rule. Near the top of the top, fixed slide are four log log scales, two each for "LL1" (top baseline) and "LL2" (bottom baseline). Printed just to the left of the top "LL1" scale is "+.00D"; printed in red to left of the bottom "LL1" scale is "-.00D". The top "LL1" scale has values ranging from 1.0024 to 1.023; the scale below it has values descending from .9976 to .977, each printed in red with a sidewise chevron on its left. Printed just to the left of the top "LL2" scale is "+.0D"; printed in red to the left of the bottom "LL2" scale is "-.0D". The top "LL2" scale has values ranging from 1.024 to 1.25; the scale below it has values descending from .977 to .80, each printed in red with a sideways chevron on its left.
Printed along the bottom edge of the top slide is a logarithmic "DF/M" scale, with values that wrap around from 2.3 to 10, then from 1 to 2.3. An identical "CF/M" scale is printed along the top edge of the center, moveable slide.
Printed second from the top along the center slide is a logarithmic slide "TH", with values ranging from .10 to 3. Below this are two "SH" scales sharing a baseline. These have values ranging from .10 to .88 (top), and from .88 to 3 (bottom). Printed fifth and sixth from the top, respectively, are scales "L_n" and "L", which share a baseline. "L_n" has values ranging from 0 to 2.3; "L" carries values from 0 to 1. Printed in red below the "L" scales, with a sideways chevron to the left of each of its values, is the inverted logarithmic scale "CI". This has values descending from 10 to 1.
Printed along the bottom edge of the center slide is a logarithmic "C" scale carrying values from 1 to 10. An identical "D" scale is printed along the top edge of the bottom, fixed slide.
Near the bottom of the bottom slide are four log log scales, two each for "LL3" (top baseline) and "LL4" (bottom baseline). Printed just to the left of the top "LL1" scale is "+.D"; printed in red to left of the bottom "LL1" scale is "-.D". The top "LL1" scale has values ranging from 1.26 to 10; the scale below it has values descending from .79 to .10, each printed in red with a sidewise chevron on its left. Printed just to the left of the top "LL2" scale is "+D"; printed in red to the left of the bottom "LL2" scale is "-D". The top "LL2" scale has values ranging from 10 to 10^10; the scale below it has values descending from .10 to 10^-10, each printed in red with a sideways chevron on its left.
The slide rule is stored in a brown leather case with hard plastic lining and flap closure. Upon purchase, it was sealed in a small plastic bag inside the leather case. Printed on a label affixed to the bag is price information on the two models included in the "Twin Pack." This slide rule came together with 1991-4-004b and 1991-4-004c in a green cardboard box marked "SLIDE RULE TWIN PACK", which also contained three different instruction booklets.
Brown leather strap, folded, with snap between two ends. A metal hook is attached to a loop at one end of the strap. This object was included in the Pickett "Slide Rule Twin Pack". The belt loop is stored in its original cardboard box, along with the above items.
Fifteen scales are printed on the face of the slide rule. Near the top of the top, fixed slide is a logarithmic "[square root]" scale carrying values from 1 to 2.15. "DIGITS 1-4-7-10 ETC." is printed directly to the left of this scale. Below this are two logarithmic scales sharing the same baseline, both labeled "[cube root]". These have values ranging from 2.15 to 4.65 (top) and from 4.65 to 10 (bottom). To the left of the scales are: "DIGITS 2-5-8-11 ETC." (top) and "DIGITS 3-6-9-12 ETC." (bottom).
Printed along the bottom edge of the top, fixed slide is a logarithmic "DF" scale, which has values that wrap around from [pi] to 10, then from 1 to [pi]. An identical "CF" scale is printed along the top edge of the center, moveable slide.
Printed in red second from the top along the center, moveable slide is an inverted logarithmic scale "CIF". To the left of each of its values, which descend from 3.2 to 1, then from 10 to 3.2, is a sideways chevron. Printed below this are two T scales sharing a baseline. The top scale has values ranging from from 5.7 to 45; the bottom scale has values ranging from 45 to 84.3. Fifth and sixth from the top, respectively, are "ST and "S" scales sharing a baseline. The "ST" scale has values ranging from .57 to 5.7. The "S" scale has two sets of values. The set printed in black ascends from 5.7 to 90. The set printed in red, with a sideways chevron to the left of each number, descends from 84.3 to 0. Below the "S" scale, printed in red with a sideways chevron to the left of each value, is an inverted logarithmic scale "CI". It has values descending from 10 to 1.
Printed along the bottom edge of the center slide is a logarithmic scale "C" carrying values from 1 to 10. An identical scale "D" is printed along the top edge of the bottom, fixed slide. Below the "D" scale is a "DI" scale identical to the "CI" scale above.
Printed near the bottom of the bottom slide are two logarithmic scales sharing a baseline. These are labeled "[root]"; "000 {DIGIT / ZERO} NOS." is printed directly to their left. The top scale has values ranging from 1 to 3.17; the bottom scale has values ranging from 3.16 to 10.
Seventeen scales are printed on the back of the rule. Near the top of the top, fixed slide are four log log scales, two each for "LL1" (top baseline) and "LL2" (bottom baseline). Printed just to the left of the top "LL1" scale is "+.00D"; printed in red to left of the bottom "LL1" scale is "-.00D". The top "LL1" scale has values ranging from 1.0024 to 1.023; the scale below it has values descending from .9976 to .977, each printed in red with a sidewise chevron on its left. Printed just to the left of the top "LL2" scale is "+.0D"; printed in red to the left of the bottom "LL2" scale is "-.0D". The top "LL2" scale has values ranging from 1.024 to 1.25; the scale below it has values descending from .977 to .80, each printed in red with a sideways chevron on its left.
Printed along the bottom edge of the top slide is a logarithmic "DF/M" scale, with values that wrap around from 2.3 to 10, then from 1 to 2.3. An identical "CF/M" scale is printed along the top edge of the center, moveable slide.
Printed second from the top along the center slide is a logarithmic slide "TH", with values ranging from .10 to 3. Below this are two "SH" scales sharing a baseline. These have values ranging from .10 to .88 (top), and from .88 to 3 (bottom). Printed fifth and sixth from the top, respectively, are scales "L_n" and "L", which share a baseline. "L_n" has values ranging from 0 to 2.3; "L" carries values from 0 to 1. Printed in red below the "L" scales, with a sideways chevron to the left of each of its values, is the inverted logarithmic scale "CI". This has values descending from 10 to 1.
Printed along the bottom edge of the center slide is a logarithmic "C" scale carrying values from 1 to 10. An identical "D" scale is printed along the top edge of the bottom, fixed slide.
Near the bottom of the bottom slide are four log log scales, two each for "LL3" (top baseline) and "LL4" (bottom baseline). Printed just to the left of the top "LL1" scale is "+.D"; printed in red to left of the bottom "LL1" scale is "-.D". The top "LL1" scale has values ranging from 1.26 to 10; the scale below it has values descending from .79 to .10, each printed in red with a sidewise chevron on its left. Printed just to the left of the top "LL2" scale is "+D"; printed in red to the left of the bottom "LL2" scale is "-D". The top "LL2" scale has values ranging from 10 to 10^10; the scale below it has values descending from .10 to 10^-10, each printed in red with a sideways chevron on its left.
The slide rule is stored in a brown leather case with hard plastic lining and flap closure. Upon purchase, it was sealed in a small plastic bag inside the leather case. Printed on a label affixed to the bag is price information on the two models included in the "Twin Pack." This slide rule came together with 1991-4-004b and 1991-4-004c in a green cardboard box marked "SLIDE RULE TWIN PACK", which also contained three different instruction booklets.
Brown leather strap, folded, with snap between two ends. A metal hook is attached to a loop at one end of the strap. This object was included in the Pickett "Slide Rule Twin Pack". The belt loop is stored in its original cardboard box, along with the above items.
Signedface, center slide, center right: [Pickett trademark] / MADE IN U.S.A.
back, center slide, top right: PICKETT / ALL METAL / SLIDE RULES
back, center slide, bottom right: PICKETT & ECKEL INC. / CHICAGO ILL. U.S.A.
front of case, below slot for flap: PICKETT
stamped on front of case: LOWELL TECHNOLOGICAL / INSTITUTE
back, center slide, top right: PICKETT / ALL METAL / SLIDE RULES
back, center slide, bottom right: PICKETT & ECKEL INC. / CHICAGO ILL. U.S.A.
front of case, below slot for flap: PICKETT
stamped on front of case: LOWELL TECHNOLOGICAL / INSTITUTE
Inscribedfront, center slide, center left: MODEL N4-ES / Vector-Type LOG LOG / DUAL-BASE SPEED RULE ;
back, center slide, center left: COPYRIGHT 1959 © / PATENT APPLIED FOR.
back, center slide, center left: COPYRIGHT 1959 © / PATENT APPLIED FOR.
FunctionFor solving mathematics problems, including problems involving multiple factors, multiplication, division, powers, roots, and trigonometric problems. For details, see the manual (primary sources).
Primary SourcesHartung, Maurice. How to Use Dual Base Log Log Slide Rules. Chicago: Picket & Eckel, Inc., 1960. Available for download here.
Hartung, Maurice. How to Use Dual Base Slide Rule Exponential Ln-L Scales. Chicago: Picket & Eckel, Inc., 1959.
Hartung, Maurice. How to Use Dual Base Slide Rule Exponential Ln-L Scales. Chicago: Picket & Eckel, Inc., 1959.
ProvenancePrivate donor, 1991. Originally purchased from the Lowell Technological Institute Bookstore (University of Lowell), September 1968.