| Type | ?
Usually a generic name preceded by the form if not standard linear length - e.g. Pocket Enhanced Mannheim. For special models often supplemented by its function/use - e.g. meteorology. Sometimes a suffix is needed to distinguish between different versions - e.g. early or late.
| Differential Comprehensive Log-Log |
|---|
| 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
| plastic |
|---|
| Length | ?
Mostly length in cm or ” (inches) of the D scale but excluding any scale extensions. But for circular or watch slide rules it is the diameter & for tubular or drum slide rules it is the overall linear scale length. For other mechanical aids it is the physical length.
| 10" |
|---|
| Scales front | ?
Standard (not maker’s) symbols for scales on front face e.g. A = X² (1-100) but § = generic symbol for any non-standard scale. Scales between solidi (/ /) are on the slide(s) whereas a vertical line ( | ) or reversed solidus ( \ ) + a symbol denotes scale(s) on a straight or bevelled side edge.
| LL01,LL02,LL03,DF / CF,CI,ISd/ITd,Td/Sd,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 for any non-standard scale. Scales between solidi (/ /) are on the back of the slide(s).
| S,ST,T,A/B,L,K,C / D,DI,Ps,Pt |
|---|
| Cursor type | ?
Basic description (incl. material) + no. of hairlines, etc on any cursor(s) or alternative to a cursor - e.g. a stylus
| plastic - 1 hairline |
|---|
| Condition | ?
Cn where n = 0-6 based on Herman van Herwijnen’s condition/quality scale
| C2 |
|---|
| 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
| black hard plastic case |
|---|
| Instructions | ?
Details like “on back of rule” and/or language of instruction sheet/booklet - generic or instructions for common layouts usually not listed
| PIC instructions for differential scales |
|---|
| 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
| Extra Thornton patented differential Trig scales & Vector analysis scales - superseded by model AA 010 |
|---|
| In-Out | ?
MM-YYYY / MM-YYYY of the date added/left the collection or <YYYY if exact MM-YYYY no longer known
| <2000/ |
|---|
