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List of Slide-Rules

For slide-rule freaks only, a detailed list of my slide-rules. Instructions for using one are here.

  1. AW Faber 309. 250mm scale. Wooden structure with white plastic facing pinned on. Single-sided with double-sided slide. Two cursors, wooden with plastic window. S, L and T scales can also be read from windows on the back. Scales on the front are unnamed. Made in Bavaria. From the presence of a model number and the solid wood construction, this one is probably from around 1910. Thanks to Emrys for this one.

    slide rule 1 thumbnail
    Larger: Front Rear

    upper stock(A)x2
    slide(B)x2
    (C)x
    lower stock(D)x
    back of slideSarcsin 0.01x2
    L1 - log x (reads log x via window on reverse)
    Tarctan 0.1x
  2. Faber-Castell 167/98 Log-Log. 125mm scale. Single-sided one-piece plastic body, with windows on reverse to read S, L and T scales with double-sided slide in normal position. Single-piece plastic cursor with area of circle and (746W)HP to kW. 5-inch scale along ruler-edge at top. Leather slip case. Made in Germany. I bought this one new and carried it always, until Joan sat on it in 1981 and cracked it. It still works.

    slide rule 2 thumbnail
    Larger: Front Rear

    upper stockLL2e0.1x
    Ax2 (with extensions, as have B, CI, C and D)
    slideBx2
    CI10/x
    Cx
    lower stockDx
    LL3ex
    EfficiencyEfficiency of motor or dynamo based on HP to kW ratio on A and B
    Volt dropVolt drop in copper cable, based on area, length and current set on A and B using special marks
    back of slideSarcsin 0.01x2
    L1 - log x (reads log x via window on reverse)
    Tarctan 0.1x
  3. Faber-Castell 167/98b Elektro. The same as 167/98 above, except: 735W=HP, centimeter ruler scale and plastic slip-case. Also the volt drop and efficiency scales are displaced to reflect metric units and continental HP. Clive Bowman found this one and the next one in London around 1982.

    slide rule 3 thumbnail
    Larger: Front Rear

    upper stockLL2e0.1x
    Ax2 (with extensions, as do B, CI, C and D)
    slideBx2
    CI10/x
    Cx
    lower stockDx
    LL3ex
    EfficiencyEfficiency of motor or dynamo based on HP to kW ratio on A and B
    Volt dropVolt drop in copper cable, based on area, length and current set on A and B using special marks
    back of slideSarcsin 0.01x2
    L1 - log x (reads log x via window on reverse)
    Tarctan 0.1x
  4. Faber-Castell 62/83N Novo Duplex. 125mm scale. Double-sided plastic with wrap-around two-piece plastic cursor. All scales have extensions. Cursor has area of circle, kW to HP (746W) and x36. Leather slip case. This and the next two Fabers have metal rod bearings for the cursor. Made in Germany. My favourite.

    slide rule 4 thumbnail
    Larger: Front Rear

    front upper stockT1arctan 0.1x (and arccot)
    T2arctan x (and arccot)
    Kx3
    Ax2
    DFpi.x
    front of slideCFpi.x
    Bx2
    CIF10/(pi.x)
    CI10/x
    Cx
    front lower stockDx
    DI10/x
    Sarcsin 0.1x (and arccos)
    STarc 0.01x (arctan or arcsin)
    Psqrt(1-(0.1x)2)
    rear upper stockLL03e-x
    LL02e-0.1x
    LL01e-0.01x
    LL00e-0.001x
    W2sqrt(10x)
    rear of slideW2'sqrt(10x)
    CI10/x
    L0.5 log x (use with W scales)
    Cx
    W1'sqrt x
    rear lower stockW1sqrt x
    D and LL0x and e0.001x (ingeniously-marked dual scale)
    LL1e0.01x
    LL2e0.1x
    LL3ex
  5. Faber-Castell 2/82. 250mm scale. Double-sided plastic with wrap-around cursor in white plastic with separate windows. Metal adjustable bridge pieces. Cursor lines for area of circle and (735W)HP to kW. Most front scales have extensions. Plastic hinged case. Made in Germany. Thanks to Mike for this one. This one's flawed for me by having C/D and CF/DF on opposite sides; CF/DF should be where the useless paired K scales are and C/D where CF/DF are.

    slide rule 6 thumbnail
    Larger: Front Rear

    front upper stockLlog x
    T1arctan 0.1x (and arccot)
    T2arctan x (and arccot)
    Ax2
    front of slideBx2
    BI100/x2
    CI10/x
    Cx
    front lower stockDx
    STarc 0.01x (arctan or arcsin)
    Sarcsin 0.1x (and arccos)
    Psqrt(1-(0.1x)2)
    rear upper stockLL03e-x
    LL02e-0.1x
    LL01e-0.01x
    Kx3 (unusual paired K for calculations)
    rear of slideK'x3
    Cx
    CIF10/(pi.x)
    CFpi.x
    rear lower stockDFpi.x
    LL1e0.01x
    LL2e0.1x
    LL3ex
  6. Faber-Castell 52/82. 250mm scale. Double-sided plastic with 2-piece plastic wrap-around cursor. Cursor has area of circle (746W) HP to kW and x36. Rigid plastic slip case. Made in Switzerland. This one saw me through upper school and university (probably bought about 1969). Before this I used a 125mm Unique and then a 250mm Blundell.

    slide rule 6 thumbnail
    Larger: Front Rear

    front upper stockLlog x
    Kx3
    Ax2
    front of slideBx2
    CI10/x
    Cx
    front lower stockDx
    LL1e0.01x
    LL2e0.1x
    LL3ex
    rear upper stockT1arctan 0.1x (and arccot)
    T2arctan x (and arccot)
    DFpi.x
    rear of slideCFpi.x
    CIF10/(pi.x)
    CI10/x
    Cx
    rear lower stockDx
    Sarcsin 0.1x (and arccos)
    STarc 0.01x (arctan or arcsin)
    Psqrt(1-(0.1x)2)
  7. Pickett N 3-T. 250mm scale. Double-sided aluminium body with adjustable metal bridge pieces. Thin and rather wobbly cursor with separate windows. Scales apparently printed on rather than engraved. Strange spring friction devices near centre position of slide make setting awkward at some positions. Compared with the other rules above, the slide is relatively much wider; also the two parts of the stock are of different widths. Sturdy leather carrying case with belt loop. Made in USA. Thanks to John for this one.

    slide rule 7 thumbnail
    Larger: Front Rear

    front upper stock square rootx1/2 (odd number of digits)
    square root(10x)1/2 (even number of digits)
    Kx3
    Ax2
    front of slideBx2
    STarc 0.01x (arctan or arcsin)
    Sarcsin 0.1x (and arccos)
    Tarctan 0.1x
    Tarctan x
    CI10/x
    Cx
    front lower stockDx
    DI10/x
    cube rootx1/3 (for 1-4-7.. digits)
    cube root(10x)1/3 (for 2-5-8.. digits)
    cube root(100x)1/3 (for 3-6-9.. digits)
    rear upper stockLL0+e0.001x (Faber LL0)
    LL0-e-0.001x (Faber LL00)
    LL1+e0.01x
    LL1-e-0.01x
    DFpi.x
    rear of slideCFpi.x
    CIF10/(pi.x)
    Lnln x
    Llog x
    CI10/x
    Cx
    rear lower stockDx
    LL2+e0.1x
    LL2-e-0.1x
    LL3+ex
    LL3-e-x
  8. Aristo 0908 Trilog. 251mm scale. Double-sided plastic, with bridge pieces on one side only. Wrap-around cursor with separate windows. Cursor lines for area of circle and x36. Upper and lower stock of different widths. Rigid plastic slip case. Made in Austria. Thanks to Dave (#1) for this one and the Jakar.

    slide rule 8 thumbnail
    Larger: Front Rear

    front upper stockLL1e0.01x
    LL2e0.1x
    LL3ex
    DFpi.x
    front of slideCFpi.x
    CIF10/(pi.x)
    CI10/x
    Cx
    front lower stockDx
    Llog x
    Kx3
    rear upper stockT1arctan 0.1x (and arccot)
    T2arctan x (and arccot)
    Ax2
    rear of slideBx2
    BI100/x2
    CI10/x
    Cx
    rear lower stockDx
    Psqrt(1-(0.1x)2)
    Sarcsin 0.1x (and arccos)
    STarc 0.01x (arcsin or arctan and arccot or arccos)
  9. Jakar No 1005. 250mm scale. Single-sided plastic with one-piece plastic cursor. Flimsy clear plastic slip case. Made in Japan.

    slide rule 9 thumbnail
    Larger: Front

    upper stockSarcsin 0.01x2
    Kx3
    Ax2
    slideBx2
    CI10/x
    Cx
    lower stockDx
    Llog x
    Tarctan 0.1x
  10. Logarex 4542-27501. 498mm scale. Single-sided plastic with one-piece rather vague cursor. Cursor has area of circle line. Scales appear to be printed on and varnished over. Extensions on A, B, C and D. Scales unnamed, though formula appears at left-hand end. My brother found this in Romania, at the equivalent of about 50p UK in 1991. It may be genuine, or a cheap local version. Showy fake skin fold-around case.

    slide rule 10 thumbnail
    Larger: Front

    upper stocklog xlog x
    x3x3
    x2x2
    slidexz2 x2
    1/x10/x
    xzx
    lower stockxx
    sinarcsin 0.01x2 (yes based on A, though at the bottom)
    tgarctan 0.1x
    exex
  11. School teaching rule. 1500mm scale. Solid wooden construction, with large graduation marks, basically a 250mm rule magnified six times. Scales painted on. Found in a school's maths department cupboard. Probably dates from 1950s, and unused for twenty years. Thanks to Rusty for this one.

    slide rule 11 thumbnail
    Larger: Front

    upper stockAx2
    slideBx2
    Cx
    lower stockDx
  12. Faber Castell 380. Scale 500mm. Wooden slide and stock with engraved plastic faces and brass pins. Double-sided slide with trig windows on the back. Metal cursor with a single line. Conversion factors and properties of materials on the back. Wood and canvas rigid case. Made in Bavaria. No scale values or names on the front, but has "Quot +1" at LH end of D and "Prod -1" at RH end to remind of index change. Inch and mm scales on stock. Stock is in two pieces with metal springs between. From the type of logo, this one probably dates from the early 1920s. Thanks to Mike for this one and the next one.

    slide rule 12 thumbnail
    Larger: Front

    upper stock(A)x2
    slide(B)x2
    (C)x
    lower stock(D)x
    back of slideSarcsin 0.01x2
    L1 - log x (reads log x via window on reverse)
    Tarctan 0.01x2
  13. Unique "Brighton". Scale 254mm. Wooden slide and stock. Stock halves joined by springy metal plate with printed formulae. Log-log on reverse of slide. Trig scales on separate scale on lower edge of lower stock, read using a special extra window on the cursor. Cm scale at upper stock. Made in England. This one is a bit tired and barely useable

    slide rule 13 thumbnail
    Larger: Front Rear

    upper stockcubex3
    Ax2
    slideBx2
    1/x10/x
    Cx
    lower stockDx
    Llog x
    sqrt(1-x2)sqrt(1-(0.1x)2)
    lower edgeSarcsin 0.1x
    Tarctan 0.1x
    back of slideLL1e0.01x
    LL2e0.1x
    LL3ex
  14. Blundell Descal 310 circular. Effective scale length about 180mm for C and D scales. Two plastic disks and clear cursor, pivoted at centre. Cicular slide rules avoid the need to reverse the slide and are easier to carry for a given scale length (this one's about 75mm diameter), but they're not so easy to manipulate. Thanks to Malcolm for this one.

    slide rule 14 thumbnail
    Larger: Front

    outer rotorLlog x
    Dx
    inner rotorCx
    CI10/x
    Ax2
    Kx3
  15. Sterling Mannheim. Scale 250mm. A basic plastic rule aimed at students, made in the USA. No frills, no cursor lines, not even a pi mark on the C and D scales (though oddly there is one on the A and B scales). This one is still in its original bubble pack priced at 1.49USD, probably early 1970s. Thanks to Santiago in Spain for this one and the next one.

    slide rule 15 thumbnail
    Larger: Front

    upper stockAx2
    slideBx2
    CI10/x
    Cx
    lower stockDx
    Kx3
    back of slideSarcsin 0.01x2
    Llog x
    Tarctan x
  16. Sterling Mannheim De-Luxe. Scale 250mm. The same slide rule as the one above but bonded to an extra plastic base with ruler edges, 1/16-inch at the top and 0.05-inch at the bottom. In a plastic slip case.

    slide rule 16 thumbnail
    Larger: Front

    upper stockAx2
    slideBx2
    CI10/x
    Cx
    lower stockDx
    Kx3
    back of slideSarcsin 0.01x2
    Llog x
    Tarctan x
  17. Fuller Calculator. This beauty is a helical slide rule with a scale length of around 13 metres. It has only the one scale, equivalent to a C, and effectively two linked cursors. Thanks to Joan for this one. Probably 1946.

    See its own page.

    slide rule 17 thumbnail
    Larger: Front

  18. Academy 310 circular. Effective scale length about 180mm for C and D scales. Two plastic disks and clear cursor, pivoted at centre. Possibly useful conversion factors on back

    slide rule 18 thumbnail
    Larger: Front Rear

    outer rotorDx
    inner rotorCx
    CI10/x
    Ax2
    Kx3
  19. Concise No28 circular. Effective scale length about 210mm for C and D scales. Two plastic disks and clear cursor, pivoted at centre. Possibly useful conversion factors on back

    slide rule 19 thumbnail
    Larger: Front Rear

    outer rotorDx
    inner rotorCx
    CI10/x
    Ax2
    Kx3
  20. Fowler long scale calculator. Effective scale length for the short scale about 190mm. Effective length for the 6-rev long-scale about 750mm. A single-scale slide-rule with 2 pointers, in operation more like the Fuller rather than the other circular slide rules.

    See its own page.

    slide rule 20 thumbnail
    Larger: Front Rear

  21. Moonstick. This is not a general-purpose slide rule like the others on this page, but it's a member of the same family. It's a modern device, which tells the phase of the moon for any date and time within a few thousand years before or after now. It is not logarithmic and performs only addition modulo one lunar cycle.

    It consists of six triangular slides that fit together in guides to make a hexagonal stack. The first four slides select the four digits of the year, with multiple scales on each slide selected by a colour code. The fifth slide selects the month and time zone (ref UTC); then the moon phase can be read off against the date and approximate local time on the sixth segment.

    It's quite hard to photograph in its assembled form. The "parts" image below shows one face of each slide separated out; some of the slides have markings on all three faces and can be used either way round.

    Moonsticks and other fascinating toys are available from wwwmoonstick.com.

    slide rule 21 thumbnail
    Larger: View Parts

  22. Aristo 0903 VS. 250mm scale. Double-sided plastic, with bridge pieces on one side only. Wrap-around cursor, cursor lines for area of circle and x36. Upper and lower stock of different widths. Rigid plastic slip case. Made in Austria. Thanks to Dave (#2) for this one and the next one.

    The odd twisted look in the images is the result of scanning it diagonally across the scanner platen in an attempt to get it all on. Scanners are designed to scan flat surfaces; when you try to scan 3-D objects you see the effect of looking at the object from different directions from one side of the platen to the other.

    slide rule 22 thumbnail
    Larger: Front Rear

    front upper stockLlog x
    Kx3
    Ax2
    front of slideBx2
    CI10/x
    Cx
    front lower stockDx
    Sarcsin 0.1x (and arccos)
    STarc 0.01x (arcsin or arctan and arccot or arccos)
    Ttan 0.1x (and arccot)
    rear upper stockcmscale 0..25cm
    DFpi.x
    rear of slideCFpi.x
    Cx
    rear lower stockDx
     scale of whole inches with short sections for 1/32 and 1/20 inches (upside down)
  23. Faber-Castell 67/98b Elektro. 125mm scale. Single-sided one-piece plastic body, with windows on reverse to read sin, lg and tg scales with double-sided slide in normal position. Single-piece plastic cursor with area of circle and (746W)HP to kW. 5-inch scale along ruler-edge at top. Leather slip case. Made in Germany. Very similar to 167/98 above except this one has 2-colour engraving, missing or non-standard scale names and no scale formulae. It also, like the metric 167/98b above, has a crib near the left-hand index of A and B scales for the units to be used for voltage drop calculations. Although the scales are the same length, the body is about 5mm shorter than the 167/98.

    slide rule 23 thumbnail
    Larger: Front Rear

    upper stock(LL2)e0.1x
    (A)x2 (with extensions, as have B, CI, C and D)
    slide(B)x2
    (CI)10/x
    (C)x
    lower stock(D)x
    (LL3)ex
    EfficiencyEfficiency of motor or dynamo based on HP to kW ratio on A and B
    Volt dropVolt drop in copper cable, based on area, length and current set on A and B using special marks
    back of slidesinarcsin 0.01x2
    lg1 - log x (reads log x via window on reverse)
    tgarctan 0.1x
  24. Otis King model K. A pocket spiral slide rule with a scale length of about 1.6 metres. Rather similar to the Fuller but instead of a single scale and two variable pointers this one has two pointers a fixed distance apart and two scales, one moving and one fixed. Z prefix serial number makes this one 1969.

    See its own page.

    slide rule 24 thumbnail
    Larger: Open Closed

  25. Thornton PIC No 121. Split wooden stock and wooden slide with plastic facings, pinned at ends. In addition to the conventional scales this one has some interesting idiosyncratic scales. Instead of the conventional sine scale for example, which is usually plotted as x = 0.1 * sin(T), this one plots x = 0.1 * T / sin(T) where T is in degrees. This makes the scales more compact, so that sine, tangent, arcsine and arctangent all fit into the space of one scale. There are also some extra short scales and pointers to the left of the rule which facilitate the setting up of interest rates using the log-log scales or simple percentages on the C and D scales. The metal cursor has a single rather fine line. Date might be 1949. Thanks to Dave (#3) for this one.

    slide rule 25 thumbnail
    Larger: Front Rear

    upper stock  scale of millimetres
    (LL2)e0.1x
    (LL3)ex
    (A)x2
    slide (B)x2
    (CI)10/x
    IDS, IDT, DS, DTspecial trig scales
    (C)x
    lower stock (D)x
    (K)x3
     scale of inches and twentieths
  26. Unique Universal. Split wooden stock with metal spring, scales printed under plastic laminate, pinned at ends. Cursor missing. Properties of materials and fractional conversions on the reverse. British. Probably 1940s or 1950s. Card slip case. No formulae; only S and T are named. Thanks to Glyn for this one.

    slide rule 26 thumbnail
    Larger: Front Rear

    upper stock (LL2)e0.1x
    S arcsin 0.01x2 (based on A)
    (A)x2
    slide (B)x2
    (CI)10/x
    (C)x
    lower stock (D)x
    Tarctan 0.1x
    (LL3)ex
  27. Fearns Calculator.

    slide rule 27 thumbnail
    Larger: Front Rear

    upper stator (LL2)e0.1x
    S arcsin 0.01x2 (based on A)
    (A)x2
    rotor (B)x2
    (CI)10/x
    (C)x
    lower stator (D)x
    Tarctan 0.1x
    (LL3)ex

(Images of 12 and 25cm rules are from a scanner; others are from a digital camera)


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