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Hemmi: 255D

Hemmi 255D Electro Hyperbolic

Details of: Hemmi - 255D

Type? A generic name (e.g. Rietz) or function/use for specialist models (e.g. Meteorology) for grouping similar models across makers. If not the “standard” 25cm linear length, preceded by the form (i.e. Demonstration, Desktop, Pocket, Waistcoat, Lilliput or Book) & when needed, a suffix to distinguish between versions (e.g. early or late). Electro Hyperbolic
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 Duplex
Material? Basic description: ivory/bone/wood/bakelite/plastic/metal/cardboard or combinations e.g. wood/veneered, wood/painted, etc bamboo/celluloid veneers
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. 25cm
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 L,K,DF / CF,CIF,CI,C / D,LL3,LL2,LL1
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 Sh1,Sh2,Th,A / B,T2,T1,S',C / D,DI,§,§
Cursor type? Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus duplex chrome/glass - 1 hairline
Condition? Cn where n = 0-6  condition/quality scale where 0 = brand new in box & 6 = broken   C0
Date? YYYY for year(s) of production or an approximation/range of years 1961- 1975
Extras? Basic description of any accessories - e.g. case or stand + where relevant, an accreditation for image, etc branded plastic bag + cream & dark-blue stiff cardboard case with branding - image courtesy of HvH
Instructions? Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed English courtesy of Greg Scott
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

For Electrical Engineering + D model no. suffix = with DI scale but otherwise replaced 155 + metal end braces

In-Out? MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known <2010/

All of:  Hemmi new search?

1 Enhanced Mannheim
1/1 Enhanced Mannheim
101A Demonstration Enhanced Mannheim
130 Darmstadt
135 Pocket Darmstadt
136 Pocket Darmstadt
149A Pocket Log-Log
255D Electro Hyperbolic
257L Chemical
259D Log-Log
260 Log-Log
2640 Enhanced Mannheim
2664S Technical
2690 Stadia Topography - 360
275 Desktop Hyperlog Electro (ver 1)
279 Desktop Expert Mechanical Engineer
30 Lilliput Enhanced Mannheim
30 Lilliput Enhanced Mannheim - late
301 Control Engineering
301A Control Engineering
32 Lilliput Enhanced Mannheim
32R (POST 1441) Lilliput Enhanced Mannheim
34 Pocket Mannheim
34P Pocket Mannheim
34R Pocket Enhanced Mannheim
34RK Pocket Rietz-like
34T Pocket Enhanced Mannheim
34T Pocket Enhanced Mannheim - late
35 Lilliput Enhanced Mannheim
40 Enhanced Mannheim
40RK Rietz-like
50 Enhanced Mannheim
64/3 Enhanced Mannheim
642T Rietz
64T Rietz
70 Desktop Improved Rietz
74 Pocket Rietz
74 Pocket Rietz - late
80/1 Electro - imperial
80/3 Electro - metric
86/3 Pocket Electro
Baseball Pocket Sport
Foxboro Pipe Flow & Valve Sizing - metric
P24 Student Technical
P253 Vectolog Log-Log
P261 Log-Log
P280 Darmstadt-like two-tone
P281 Rietz-like two-tone
P40RK Enhanced Mannheim
P45K Technical
P45S Technical