USD $189
12″/10″ 944-28 Duplex Slide Rule
This rule is in excellent condition, although the factory case has some marking and wear. The 944-20 features the trademark S/M blue slide and body braces, multi-line cursor, plus two color (red/black) scale markings, and folded scales. The rule is self documenting on the right hand side for all scales. This an advanced rule for engineers, mathematicians, and demon slayers (if you know, you know…).
(24 Scales, 6 Cursor Lines)
Front – LL-1, LL-2, LL-3, DF, [CF, CIF, CI, C], D, LL3, LL2, LL1
Back – L, K, A, [B, ST, T, S, C], D, DI, LL0, LL-0
Stock: 1
USD $169
12″/10″ 544 LL Simplex Slide Rule
NIB, A visually beautiful rule, complete with 2 part plastic case, manual, and factory box. The 544LL features the trademark S/M blue slide and body braces, multi-line (4 line) cursor, plus two color (red/black) scale markings, and folded scales. The rule is self documenting on the right hand side for all scales. The ‘invisible brace’ style with braces on the back gives the rule a very clean European look from the front. Blank on the reverse side, with two rulers.
(14 Scales, 4 Cursor Lines)
Front – L, K, A, [B, CI, C], D, S, ST, T
Back – [S, LL1, LL2, LL3], Rulers – metric and imperial
Stock: 1
USD $125
12″/10″ 54401 Simplex Rule
This is a used rule with an extensively worn case, and some staining on the rule. This rule features a very rare P-scale, an imperial ruler on the upper rule edge, and is designed with engineers in mind. It features four cursor lines for energy and power conversions, and multiple technical references on the reverse side.
(8 Scales, 4 Cursor Lines, 1 Ruler – inches)
Front – L, K, A, [B, CI, C], D, P, S, T
Back – LL1, LL2, LL3, Formula references, common conversion factors, weight and metal references
Stock: 1
USD $59
Full size rule, new/mint condition, features blue/white contrast markings on the slide, and red/black etched markings on the rule for easy reading.
(23 Scales, 7 cursor lines)
Front – T1, T2, DF, CF, CIF, S, C, D, (P), S, ST
Back – LL0, L, K, A, B, BI, CI, C, D, LL3, LL2, LL1
Stock: 1
USD $125
Staedtler Mars 544 DLL, Full Size Duplex (NIB)
(23 Scales, 4/4 Cursor Lines)
Front – T1, T2, A, B, BI, CI, C, D, (P), S, ST
Reverse – LL1, LL2, LL3, DF, CF, CIF, CI, C, D, K, L, LL0
Stock: 1
USD $65
A visually beautiful rule, complete with 2 part plastic case and factory box. The 544A features the trademark S/M blue slide and body braces, multi-line (5 line) cursor, plus two color (red/black) scale markings, and folded scales. The rule is self documenting on the right hand side for all scales. Staedtler-Mars rules are highly requested but quite uncommon in North America, and are very well made designs. Attractive blue slide and body braces, complement the bright blue and white two part plastic case. The folded scales are especially useful for mark-up/discount calculations, and a center index is well marked for this. The ‘invisible brace’ style with braces on the back gives the rule a very clean European look from the front.
Blank on the reverse side. These were still sealed in a factory bulk pack, so everything is in mint condition. We have included reprints of the S/M consolidated rule instructions because these came factory packed with no instructions.
(8 Scales, 5 Cursor Lines) (RH)
Front – K, DF, [ CF, CIF, CI, C, ] D, A
Back – Blank
Stock: 7
USD $145
This Staedtler rule features metal cursor end caps, and metal braces with supporting ridges to allow for desktop use of the rule. Includes a new leather case engraved with the Sphere Research Logo.
Scales include:
Front – A, B, C, D, L, K, LL1, LL2, LL3, LL01, LL02, LL03
Back – C, D, P, S, T, CF, CI, DF, CS, CT, ST, CIF
Stock: 1
Sphere Research Corporation