Reference / Paper · 2006
One-page illustrated chart dating Pickett rules c.1945-1975 by alloy, slide/rail interface, slide tension springs, end-brace (stator post) style, cursor bars, lenses and logo style (Styles 0-6). Used to date the N-515-T and any Pickett.
VB YF shalt & ' ic ¢ - [ i Wiel "Vuh | Stamped Aluminum Posts & Bars Stamped Aluminum Stamped Aluminum Stamped Aluminur Straight Posts Straight Posts Contoured Posts Stamped Aluminum woo LLL ; . Stainless Steel Posts Posts & Bars Die-Cast Aluminum Posts th th if nf Ta atti ii] if dad prise, mh | -13 pp —11 —10 Ls -8 —7}-6 — -6 -$ -5 -5 ta —4 -af-3 — —4 -p -3 -3 bs -2 -2f-2 — Extended Nylon Cursor Bars, Grooved Flat Lens Nylon Cursor Bars Nylon Cursor Bars, Grooved Convex Le Grooved Convex Lens Plain Flat Lenses 2.6mm thick Aluminum Stock No Serial Numbers Cursor Bars, 4mm thick Plain Flat Lenses Injection-molded Magnesium Stock Grooved Stock Grooved Flat Lens Plain Flat Lenses Grooved Stock Die-Cast Aluminum XN a XN 7 a Picket Fickelt iW Ww Vv L. Ke) acl PICKETI Style 0 (no logo) Style Style 2 Style 3 Style 4 Style 5 Style 6 1945-1950 1945-1950 1949-1950 1950-1958 1958-1962 1962-1964 1964-1975 YEAR 45 5052 | 57 [59 | 6062 [66 75 (APPROXIMATE) | | | | | | | PERIOD l 2 3 4 5 6 7 8 ALLOY MAG. ALUMINUM SLIDE/RAIL INTERFACE GROOVED RAILS GROOVED SLIDE SLIDE TENSION - SPRINGS SLIDE TENSION SPRINGS STATOR SMOOTH STAMPED POSTS DIE-CAST | |STAMPED GROOVED STAMPED POSTS POSTS CONTOURED TO FINGER TIP STRAIGHT] | STRAIGHT CONTOURED TO FINGER TIP CURSOR " BARS MACHINED METAL BARS ape LO! LENSES PLAIN FLAT GROOVED FLAT GROOVED CONVEX LENSES LENSES LENSES LOGO 0,1,2,3 3 3.4 3,4 4 4 4,5,6 6 Chronology of Pickett Slide Rule Development Figures by Mike Konshak. Based on the research of Dr. Rodger Sheperd, as Published in the Journal of the Oughtred Society, Vol . 1, No. 1, 1992