• 455 Martinson, Los Angeles
  • 8 (043) 567 - 89 - 30
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  • Ruxton Multi-Vider drop-lead pencil & slide rule
  • 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: LOGA
ModelTypeMaterialCommentsThumbnail
15m (ver. E) Desktop Basic long-scale metal/paper

Serial No. 155202 (“15” correlates to scale length & “5202” = no.) + version “E” = Einfach/elementary

LOGA 15m (ver. E) Desktop Basic long-scale
2,4m (ver. E) Desktop Basic long-scale - yellow metal/paper

Serial No. 2237 (possibly correlates to overall scale length) + version “E” = Einfach/elementary

LOGA 2,4m (ver. E) Desktop Basic long-scale - yellow
30E (ver. 2) Basic metal/paper

Model suffix “E” = Einfach/elementary - budget 3-spoke metal backplate - see also bigger sibling

LOGA 30E (ver. 2) Basic
30RC (ver. 2) Business metal/paper

Serial No. 65 + model suffix “R” = with reciprocal scale & “C” = commercial + turning lever - try out here the online simulation created by Andries de Man

LOGA 30RC (ver. 2) Business
30RZh Retail/Conversion metal/paper

Serial No. 0289 + model suffix “R” = with reciprocal scale, “Z” = extra Zins/interest scale & “h” = with turning lever - see also bigger sibling

LOGA 30RZh Retail/Conversion
30sR (ver. 2) Basic+ aluminium/paper

​Model suffix “s” = lightweight construction & “R” = with reciprocal scale + back anodised brass colour & serrated/knurled edge to disc

LOGA 30sR (ver. 2) Basic+
30sT Technical metal/paper

Model suffix “s” = lightweight construction & “T” = Technisch/technical scales + budget 3-spoke metal backplate - see also bigger sibling

LOGA 30sT Technical
30Tt/360º Technical metal/paper

Serial No. 64207 + model suffix “T” = technical scales & “t” = with trig scales + black turning lever - try out here the online simulation created by Andries de Man

LOGA 30Tt/360º Technical
30Tt/360º Technical - early metal/paper

Serial No. 1659 + model suffix “T” = technical scales & “t” = with trig scales + grey turning lever - try out here the online simulation created by Andries de Man

LOGA 30Tt/360º Technical - early
7,5m (ver. E) Desktop Basic long-scale - white metal/paper

Serial No. 751030 (“75” correlates to scale length & “1030” = no.) + version “E” = Einfach/elementary

LOGA 7,5m (ver. E) Desktop Basic long-scale - white
75E Desktop Basic long-scale aluminium/paper/bakelite

Model suffix “E” = Einfach/elementary - see also smaller sibling - try out here the online simulation created by Andries de Man

LOGA 75E Desktop Basic
75EA Desktop Basic/Monetary/Conversion long-scale aluminium/paper/bakelite

Serial No. 3474 + model suffix “E” = Einfach/elementary & “A” = additional scales for GBP & imperial/metric conversions - try out here the online simulation created by Andries de Man

LOGA 75EA Desktop Basic/Monetary/Conversion
75RZ (ver. 2) Desktop Retail/Conversion long-scale aluminium/paper/bakelite

Serial No. 4100 + model suffix “R” = with reciprocal scale & “Z” = extra Zins/interest scale - see also smaller sibling

LOGA 75RZ Desktop Retail/Conversion
75T Desktop Technical long-scale aluminium/paper/bakelite

Model suffix “T” = Technisch/technical scales + more accurate later addition to product range marketed to both schools & commerce - see smaller sibling - try out here the online simulation created by Andries de Man

LOGA 75T Desktop Technical long-scale
K150d Pocket Technical/Business Rietz-like aliminium/cardboard

Model prefix “K” = Kaufmann/merchant & suffix “d” = Duits/German version + unusually separate slide for each side of closed frame i.e. front (yellow slide) for business use & back (green slide) for technical use + many currency gauge points on front face/cursor + adjoined CI/% = ½ length scales + table of gauge points abbreviations in front well + table of constants in well on back ​- see also bigger sibling

LOGA K150d Pocket Technical/Business Rietz-like
K300d Technical/Business aliminium/cardboard

Model prefix “K” = Kaufmann/merchant & suffix “d” = Duits/German version + unusually specific slide for each side of closed frame i.e. front (yellow slide) for business use & back (green slide) for technical use + many currency gauge points on front face/cursor + adjoined CI/%/§ on front = mini scales + table of gauge points abbreviations in front well + % scale on back = 2-part - see smaller pocket sibling

LOGA K300d Technical/Business
Topo (ver. 2) Military Artillery Mils - early metal/paper

Serial No. 195 exclusively made for Swiss Army for artillery based azimuth calculations - two inner scales on front calibrated for 6400 A ‰ or NATO Mils (A ‰ = 2 x 3200)

LOGA Topo (ver. 2) Military Artillery Mils
Topo (ver. 3) Military Artillery Mils metal/paper

Serial No. 1119 exclusively made for Swiss Army for artillery based azimuth calculations - two inner scales on front calibrated for 6400 A ‰ or NATO Mils (A ‰ = 2 x 3200) - try out here the online simulation created by Andries de Man

LOGA Topo (ver. 3) Military Artillery Mils
Wetter (30E) Basic metal/paper

Specially commissioned 30E for advertising by Zurich-based Wetter - budget 3-spoke metal backplate

LOGA Wetter (30E) Basic