| NAME | MATCH NR. |
DESCRIPTION |
| Napier set of blocks | 3448 | Generic blocks of all wood |
| National Foundation Depth Calculator | 5285 | Log/tech slide chart of plastic, 217x108x1.6 mm (1992) Front Scales: See Picture, Back Scales: See Picture |
| Natrilix Cardiovascular Risc Calculator | 1447 | Medical disc of plastic |
| Nautical Scale of Power and Speed | 2333 | Nautical slide rule of all wood, 360x94x11 mm Front Scales: 1) = 2) 3) = 4), Back Scales: 5) = 6) = 7) |
| Nautical Tek. no. 3460 116 | 2676 | Nautical slide rule of perspex/aluminium, 322x54x16 mm |
| Navigational Computer MK. III H REF. no. 6B / 250 | 1741 | Aviation disc of metal/bakelite, 135x155x26 mm |
| Navy Department Drift Angle Computer Device 1-CH-1 | 3529 | Aviation disc of plastic, 110x2 mm |
| NBC voorspellingsset NSN 6665 13 108 7501 and 6665 13 108 7097 | 2859 | By Memento NBC, log/tech disc of plastic, 102x2.5 mm (1973) |
| Nederlandse Benzolmaatschappij | 5306 | By NBM, technical slide chart of cardboard, 155x176x1.2 mm Front Scales: See Picture, Back Scales: See Picture |
| Neolt 25 R Bergamo Italy Rietz | 3850 | Generic slide rule of wood/plastic, 292x39.5x12 mm Front Scales: 27cm / K A = B CI C = D L ] 1:25 Back Scales: = S S&T T = |
| Neolt TS 10 | 3887 | Generic slide rule of plastic, 120.5x25x2.5 mm Front Scales: 10cm / A = B C = D |
| Newton slide rule to calculate Ax3+Bx2+Cx=D | 3851 | Mathematics slide rule of wood/plastic, 350x206x12 mm |
| Nicholl App. Obs of Fire Mk VI | 2876 | Military slide rule of aluminium/brass, 405x35x6 mm (1918) Front Scales: K = K, Back Scales: K = S |
| Night Photographic Flash Sighting Angle and Release Distance Computer 6B / 3132 | 1990 | Aviation disc of metal, 180x6 mm Front Scales: 1) 2) 3) 4) = 5) 6) 7) Back Scales: 8) 9) = 10) 11) |
| Nomo Type 0 | 3243 | Disc |
| Nomus SKF Rollenlager | 1991 | Technical slide chart of plastic, 260x65x2.8 mm |
| Noralem Industries Regle a Curseur | 5314 | Technical slide chart of cardboard, 300x100x1.5 mm Front Scales: See Picture, Back Scales: See Picture |
| Norelco Miles per gallon and Twenty three year calender | 2085 | Log/tech disc of metal, 42.5x1.4 mm (1955) Front Scales: Miles driven = Miles per Gallon = Gallons |
| Norma 100 Gambrinus | 2087 | Log/tech disc of plastic, 106 mm Front Scales: units A = B 1) 2) cos |
| Norma 100 Grafia | 2086 | Log/tech disc of plastic, 106x6 mm Front Scales: C = D 1) |
| Norma 190 Gambrinus | 3515 | Generic disc of metal, 190x5 mm |
| Normus NT 62 J. Eberspächer Glasdachwerk System Huber (IWA) | 5708 | Log/tech slide chart of cardboard, 243x91x1.7 mm |
| Normus NT 71a Eisenbetonplatte System Huber (IWA) | 5709 | Log/tech slide chart of cardboard, 245x91x1.5 mm |
| Normus- Schieber Nussbaum No. 2/7 (IWA) | 5691 | By IWA, log/tech slide chart of cardboard, 220x70x1 mm (1924) |
| Norton Rekenschijf voor Slijp- en Polijstschijven | 2764 | Log/tech disc of plastic, 149x87x1 mm |
| Novotni Slide Rules Weight Slide Rule | 3281 | Log/tech slide rule of wood/plastic, 354x64x6.5 mm (1959) Front Scales: Thickness = Width Length = Subjects = Weight in Pounds |
| Novotni Weight Slide Rule | 5077 | Log/tech slide rule |
| Nuclear Yield M4A1 | 5059 | Military disc |
| Ohico Electro 15 | 2093 | Electrical slide rule of wood/plastic, 280x36x11 mm Front Scales: 26cm / LL2 A = B C = D LL3 ] 10inch #Dynamo Motor h% Volt#, Back Scales: = S L T = |
| Ohico System Rietz | 3128 | Generic slide rule of wood/plastic, 278x36x11 mm Front Scales: 26cm / K A = B C = D L ] 10inch Back Scales: = S ST T = |
| Opstalan Schuifmetertje Benzineverbruik | 5393 | Technical slide chart of cardboard, 159x50x0.7 mm Front Scales: See Picture, Back Scales: See Picture |
| Orgelbau Fachverlag System Rensch (Organ) | 3583 | By Mensur, music slide rule of plastic, 395x92x2.5 mm (1986) |
| OTK PRK 69 | 5436 | Military disc of plastic, 240477x16 mm Front Scales: 1-10000 = Ctg Cosec Back Scales: 1-10000 = tg Sec |
| OTK no 1 Russian | 2719 | Military slide rule of wood/plastic, 550x44.5x9 mm (1970-1981) Front Scales: 1) = 2) 3) = 4), Back Scales: 5) = 6) = 7) |
| OVVM thuis-taxateur | 5421 | Disc |