USD $35
Koh-I-Noor 3065 HRS7 Drafting Pen Set
Stock: 1
USD $29
BRAND NEW Logarex/Koh-I-Noor Trig slide rules, complete with cases and printed instructions. This pocket rule features both inch and cm rulers, data references on the reverse side, and self-documenting, with actual values (X, 1/X, etc.) rather than just random scale names, great for fast learning.
9 Scales + 2 Rulers)
Front – K, A, [ B, CI, C ] D, L
Back – inch [ S, T ] cm + Data
Stock: Lots
USD $199
5″ Log Log Duplex Slide Rule
VERY LATE MODEL, made in Czechoslovakia. Powerful pocket rule with red and black scales, 6 log log scales, pythagorean and folded scales, and 4 line cursor. Unusually marked, this rule contains ONLY scale equivalents, no arbitrary letters. Has a soft black leatherette case with Logarex embossed on one side. A very powerful and well-designed rule, equal to the K+E 4181-1 and Post Versalog 1461, if not better, but uncommon in North America.
(23 Scales, 4 cursor lines)
FRONT- log, sq rt(1-X2), X3, X2, [ X2, 1/X, X, ] X, tg, sin, s-t
BACK- e0.01X, e0.1X, eX, piX [ 1/piX, 1/X, X, ] X, e-X, e-0.1X, e-0.01X
Stock: 2
USD $25
This is an unusual two-cursor rule, with metric and imperial rulers along the upper and lower edges.
(7 Scales)
Front – A, S, ST< T, D [B, C]
Back – Common formulae
Stock: 1
USD $119
10″ Logarex/Koh-I-Noor Darmstadt Slide Rule VERY LATE MODEL, made in Czechoslovakia. Powerful, brand new full sized rule with front and back cm/inch edge rulers, smooth black scales, 3 log log scales on the slide reverse, pythagorean and trig scales, and 4 line cursor, and dual reverse side body cursors. Unusually marked, this rule contains ONLY scale equivalents, no arbitrary letters. Has a soft black padded leatherette case with top flap, and the name of the UK distributor for Logarex (Hellerman) embossed on one side. A very powerful and well-designed rule, but uncommon in North America. Like Pickett rules, this is lithographically made, not engraved, and has a shiny top coating for protection of the printed scales. A very nice desk rule to use for many purposes, thanks to the dual rulers. The 4 page Hellerman basic instructions are included.
(14 Scales, 4 cursor lines, 2 Rulers) (RH)
FRONT- cm/ log, sq rt(1-X2), X3, X2, [ X2, 1/X, X, ] X, sin, tg, s-t
BACK- inch/ [ e0.01X, e0.1X, eX ] Factors on the body area
Stock: 27
USD $50
Made under the joint marques fo KOH-I-NOOR and Graphoplex is this X2. Features a metric ruler along the top edge and original leather case in good condition.
Scales include:
Front – a, b, b^2, B, B^2, B^3, L, LL1, LL2, LL3, cos, S, T, S&T
Back – Blank
Stock: 1
USD $39
New and in mint condition, made in Czechoslovakia. A great beginner and student rule.
Basic Rietz format rule (has over-range scale extensions for easier operation) with added reference features. It has a black/red self-documenting scale arrangement and pale yellow slide. The slide reverse has trig (S, ST, T) scales, and the back has a treasure trove of useful data and factors. It has a slightly magnifying multi-line simplex cursor design that does area of a circle, plus some other interesting stuff like horsepower conversion. These are beautifully made rules, very well constructed. We will include basic instruction reprints, as these came bulk packed with with no manuals.
Stock: LOTS!
Sphere Research Corporation