• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
  • support@email.com

Graphoplex: 650

Graphoplex 650 Pocket Electro

Details of: Graphoplex - 650

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Keyring, Lilliput or Book) + if needed, qualification to distinguish between versions (e.g. early or late). Pocket Electro
Sort? L/C/D/T/W/X where L=Linear, C=circular, D=Drum, T=tubular, W=watch, X=miscellaneous (i.e. the rest) L
Construction? Basic construction form of the body i.e. Closed/solid frame or Open frame or Duplex or Other Closed/solid frame
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc plastic
Length? Mostly the linear length of the D scale (in cm or inches) excluding any extensions. For circular/watch slide rules it is the diameter but for helical/tubular/drum slide rules it is the overall scale length. For other calculating aids it is the physical length. 12½cm
Scales front? Standard (not maker’s) symbols for scales on front face e.g. A = X² (1-100) but § = generic symbol (signum sectiōnis) for any non-standard scale + scales between solidi / / are on the slide(s) whereas scales after vertical line | or after reversed solidus \ are on a straight or bevelled top or bottom side edge cm \ L,K,§,A / B,CI,C / D,§,W,V
Scales back? Standard (not maker’s) symbols for scales on back face e.g. S = sine (5° to 90° & 85° to 0°) or sin(x) but § = generic symbol (signum sectiōnis) for any non-standard scale + scales between solidi / / are on the back of slide(s) but scales listed after / / - notation are on another surface e.g. back of stock or inside a lid / ST,S,T,C /
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus wide clear plastic - 1 hairline + 2 peripheral hairlines
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C3
Date? YYYY for year(s) of production or an approximation/range of years 1970s
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc image courtesy of PHOTOCALCUL
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed French for 650
Booklet (PDF)? Downloadable .PDF copy of unusual or uncommon model specific instructions download
Comments ? Any special or noteworthy traits + significant use-related facts + pertinent details of scales/tables in well of stock + any significant tables, etc on the back of the stock

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

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2015/

All of:  Graphoplex new search?

ModelType
1600 School Rietz C.A.P.
1600 School Rietz C.A.P. - blue bands
1612 Pocket Rietz - early & all black
1614 Demonstration School Log-Log
1614 School Log-Log C.A.P.
1694 Technical
16oo School Riez C.A.P. - early & all black
604 Typography Cicero printing
612 Pocket Rietz
615 Pocket Rietz
620 (ver. 5) Rietz
620 d (ver. 1) Rietz
6245 Desktop Electro Log-Log
6250 Desktop Rietz
630 Geometre Stadia Topography - 400g early
640 Electro Log-Log
643 Pocket Electro Log-Log
647 Darmstadt
650 Pocket Electro
680 STATOS Reinforced Concrete - System Lüthy/Nussbaum
681 STATOS Pocket Reinforced Concrete - System Lüthy/Nussbaum
690 (ver. 2) Neperlog Log-Log
690 a Neperlog Log-Log
694 a Technical/Log-Log
CALTEX Petroleum Rietz
DYNSTAT Desktop Impact Testing
EDF 355.145 Electrical Power Cables
FLEXIMAX Steel Beams - System Potzsch/Demulder/Gajac
Gaz de France 65-TX-01 Pocket Gas Pressure/Flow in Pipes & Ducts
KOH-I-NOOR 10020 Technical
Meteo No. 2 Meteorology - early & all black
(NoName) 615 Pocket Rietz - early
(NoName) 620 Rietz - early
Panneau Publicitae Demonstration/Display Log-Log
REVACO Hydralic/Pipes/Valves flow rates
REVACO II Hydralic/Pipes/Valves flow rates
ROPLEX Rietz
SHELL (ver. F) Pocket Heating Oil Central Heating Efficiency
SHELL (ver. NL) Pocket Heating Oil Central Heating Efficiency
SHELL-MEX/BP Pocklet Heating Oil Stack-Loss
THERMOCOAX Metrology Electro