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  • Rare Otis King Model K - white scales on black background
  • Pocket Hexadecimal Slide Adder for Computer Programmers
  • Post 1824 Dring & Fage Alcohol Gauging Rule
  • Darnley’s Rotable Lightning Calculator/Pencil Case
  • Lawrence Antenna (classified by UK & US during WWII) for Radar Beam Pattern Detection
  • Makeba Kombinator pencil & slide rule
  • Rare Carbic-made Fischer Calculator
  • For Calculating Strength of Liquids in Twaddells !!
  • PTT rule for Cable Radio (Signal Loss/dB)
  • Smallest drum (≈ 2.4m) made by LOGA

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You searched for: Graphoplex
ModelTypeMaterialCommentsThumbnail
1600 School Rietz C.A.P. plastic Graphoplex 1600 School Rietz C.A.P. Graphoplex 1600 School Rietz C.A.P.
1600 School Rietz C.A.P. - blue bands plastic

Grey plastic case denotes a later model - “easy reading” blue banding for A/B & C/D scales ​

Graphoplex 1600 School Rietz C.A.P. - blue bands Graphoplex 1600 School Rietz C.A.P. - blue bands
1612 Pocket Rietz - early & all black plastic

one open window right with 1 hairline in back - black logo = early model

Graphoplex 1612 Pocket Rietz Graphoplex 1612 Pocket Rietz
1614 Demonstration School Log-Log plastic

Does not have cm top edge scale on standard 25cm 1614

1614 School Log-Log C.A.P. plastic Graphoplex 1614 School Log-Log Graphoplex 1614 School Log-Log
1694 Technical plastic Graphoplex 1694 Technical Graphoplex 1694 Technical
16oo School Riez C.A.P. - early & all black plastic

Note mixed alphanumeric 16oo model no. - layout different to standard/later 1600 Rietz - black logo = early model​

Graphoplex 16oo School Rietz C.A.P. Graphoplex 16oo School Rietz C.A.P.
604 Typography Cicero printing plastic

No slide - Cicero (old French thumb unit of measure = 27.07mm) is a typographic unit similar to a pica but with 15th century origins​

Graphoplex 604 Typography Cicero printing Graphoplex 604 Typography Cicero printing
612 Pocket Rietz plastic

one open window right with 1 hairline in back

Graphoplex 612 Pocket Rietz Graphoplex 612 Pocket Rietz
615 Pocket Rietz plastic

Slightly longer than the 612 - one open window right with 1 hairline in back​

Graphoplex 615 Pocket Rietz Graphoplex 615 Pocket Rietz
620 (ver. 5) Rietz plastic

One closed window right with 1 hairline in back​

Graphoplex 620 (ver. 5) Rietz Graphoplex 620 (ver. 5) Rietz
620 d (ver. 1) Rietz plastic

Model no. on back of slide - one open window with cursor line in back on right​

Graphoplex 620 d Rietz Graphoplex 620 d Rietz
630 Geometre Surveying Topography - 400 g early plastic

Missing model no. + table but one open window with cursor line in back on right

Graphoplex 630 Surveying Topography Graphoplex 630 Surveying Topography
640 Electro Log-Log plastic

Retail stationer’s name Joseph Gilbert on back + one open window with 1 hairline ​in back

Graphoplex 640 Electro Log-Log Graphoplex 640 Electro Log-Log
643 Pocket Electro Log-Log plastic

Name of NL company Ingersoll-Rand in well of stock - one open window right with 1 hairline in back

Graphoplex 643 Pocket Log-Log Graphoplex 643 Pocket Log-Log
647 Darmstadt plastic

Unusual inclusion of AI scale ​

Graphoplex 647 Darmstadt Graphoplex 647 Darmstadt
650 Pocket Electro plastic

§ scales = 2-part COS scale - unusually for Electro’s W & V scales on front face ​

Graphoplex 650 Pocket Electro Graphoplex 650 Pocket Electro
680 STATOS Reinforced Concrete - System Lüthy/Nussbaum plastic

Patented design (CH314378) by Peter Lüthy & Max Nussbaum - § scales for N = 10 - Co. name MONTEFERNO, Bodio (CH) in well & on back - table of constants on back

Graphoplex 680 STATOS Reinforced Concrete Graphoplex 680 STATOS Reinforced Concrete
681 STATOS Pocket Reinforced Concrete - System Lüthy/Nussbaum plastic

Patented design (CH314378) by Peter Lüthy & Max Nussbaum - § scales for N = 10 - Co. name MONTEFERNO, Bodio (CH) & table of constants on back

Graphoplex 681 STATOS Pocket Reinforced Concrete Graphoplex 681 STATOS Pocket Reinforced Concrete
690 a Neperlog log-log plastic

Impressive layout of 26 scales - Neper or Np is a logarithmic unit of measurement of physical field & power quantities - comparable to ARISTO 0968

Graphoplex 690 a Neperlog log-log Graphoplex 690 a Neperlog log-log
CALTEX Petroleum Rietz plastic

Same model rebadged for TEXACO & ​CALCRUDE - red outline of logo = early - bizarre cursor design - °F & °C scales in well of stock - back of slide has American Petroleum Institute (API) crude oil gravity scales - table of constants + CALTEX logo on back

Graphoplex CALTEX Petroleum Rietz Graphoplex CALTEX Petroleum Rietz
DYNSTAT Desktop Impact Testing plastic

DYNSTAT is a mechanical impact/resilience testing method popular in Germany (DIN 53435) for testing small samples of plastic ​

Graphoplex DYNSTAT Desktop Mechanical Impact Testing Graphoplex DYNSTAT Desktop Mechanical Impact Testing
EDF 355.145 Electrical Power Cables plastic

EDF = Electricitè de France - identical to model EDF 35 11 408 - table of values for single-phase lines in well of stock​ - table of maximum permissible intensity values on back

Graphoplex EDF 355.145 Electrical Power Cables Graphoplex EDF 355.145 Electrical Power Cables
Gaz de France 65-TX-01 Pocket Gas Pressure/Flow in Pipes & Ducts plastic Graphoplex Gaz de France 65-TX-01 Pocket Gas Pressure/Flow in Pipes & Ducts Graphoplex Gaz de France 65-TX-01 Pocket Gas Pressure/Flow in Pipes & Ducts
KOH-I-NOOR 10020 Technical plastic

Part of series for Czech stationer KOH-I-NOOR - copy of model 1694​

Graphoplex KOH-I-NOOR 10020 Technical Graphoplex KOH-I-NOOR 10020 Technical
Meteo No. 2 Meteorology - early & all black plastic

Simpler version of two Meteo models ​for weather forecasting - distance scales in both imperial & metric - black logo = early model

Graphoplex Meteo No. 2 Meteorology Graphoplex Meteo No. 2 Meteorology
(NoName) 615 Pocket Rietz - early plastic

Early because lacking model no. + red outline of logo​ - longer than usual for pocket - two open windows with cursor line in back

Graphoplex NoName 615 Pocket Rietz-early Graphoplex NoName 615 Pocket Rietz-early
(NoName) 620 Rietz - early plastic (PPMA)

Early because milky white original plastic + lacking model no. + red outline of logo​ - two closed windows with cursor line in back + table of constants om back

Graphoplex NoName 620 Rietz-early Graphoplex NoName 620 Rietz-early
Panneau Publicitae Demonstration/Display Log-Log plastic

100% dummy - scale layout printed on sheet of plastic as shop window advertising item - also made half-size version​

Graphoplex Panneau Publicitae Demonstration/Display Model Graphoplex Panneau Publicitae Demonstration/Display Model
REVACO Hydralic/Pipes/Valves flow rates plastic

Made for CONTROLEXACT (later version II for COMSIP AUTOMATION) - for calculating flow (liquid & gas) in valves & flowmeters - REVACO = registered trademark - unusual layout/design & striking cursor

Graphoplex REVACO Hydralic/Pipes/Valves flow rates Graphoplex REVACO Hydralic/Pipes/Valves flow rates
REVACO II Hydralic/Pipes/Valves flow rates plastic

Made for COMSIP AUTOMATION (original version for CONTROLEXACT) - for calculating flow (liquid & gas) in valves & flowmeters - REVACO = registered trademark - unusual layout/design & striking cursor

Graphoplex REVACO II Hydralic/Pipes/Valves flow rates Graphoplex REVACO II Hydralic/Pipes/Valves flow rates
ROPLEX Rietz metal/plastic

Designed for rapid & accurate calculating - circular but housed in square case - front & back shown as per instructions - slide also worked by metal wheel - table of gauge points in centre​

Graphoplex ROPLEX Rietz Graphoplex ROPLEX Rietz
SHELL Pocket Petroleum Central Heating Efficiency plastic

Unique construction with slide being part of closed frame (no cursor) on back of stock​ - registered design commissioned by Shell Nederland Verkoopmaatschappij (SNV) - used by Heating Oil Inspectors with equipment for measuring CO2 levels, temperature & soot content of exhaust gasses in the flue - read more ...

Graphoplex Shell Pocket Petroleum Central Heating Efficiency Graphoplex Shell Pocket Petroleum Central Heating Efficiency
SHELL Pocket Petroleum Central Heating Efficiency - NL version plastic

Unique construction with slide being part of closed frame (no cursor) on back of stock​ - registered design commissioned by Shell Nederland Verkoopmaatschappij (SNV) - used by Heating Oil Inspectors with equipment for measuring CO2 levels, temperature & soot content of exhaust gasses in the flue - read more ...

Graphoplex Shell Pocket Petroleum Central Heating Efficiency - NL version Graphoplex Shell Pocket Petroleum Central Heating Efficiency - NL version
SHELL-MEX/BP Pocklet Petroleum Stack-Loss plastic

Shell-Mex & BP logo’s on back + one open window with 1 hairline in back - follow-on from earlier OEM Central Heating Efficiency model made for Shell in NL (SNV)​ - read more ...

Graphoplex Shell-Mex/BP Pocklet Petroleum Stack-Loss Graphoplex Shell-Mex/BP Pocklet Petroleum Stack-Loss
THERMOCOAX Metrology Electro plastic

Top 3 scales are constants for Chromel, Iron & Chromel/Alumel - bottom 4 scales are for Chromel/Alumel (but smaller range) & Platinum/Rhodium (3 different %‘s) - scales on front of slide are for 2 different voltages of electrical couplings ​- inch scale on back

Graphoplex THERMOCOAX Metrology Electro Graphoplex THERMOCOAX Metrology Electro