Archive of Collections




The Bob Otnes Collection


Toggle Index


12 inch rules

Acu-Rule / Concrete Volume

Aristo / 0903LL

Aristo / 940 Stahlbeton

Aristo / 0958 Surveyor Geodat

Aristo / 0906 BiScholar

Aristo / 0971 Hyperbolog

Aristo / 0968 & 868

Aristo / Six Rules -NIB (New In Box)

Blundell Harling / Reitz Rules 803 and 813

Blundell Harling / S143 and S150

Dennert & Pape / Mannheim

Dennert & Pape / Mannheim

Dennert & Pape / Mannheim Gun Mark w/o cursor

Dennert & Pape / Mannheim

Dennert & Pape / Mannheim

Dietzgen / 1735

Dietzgen / 1745

Dietzgen / 1750

Dietzgen / 1762-B

Dietzgen Phillips / 1759-B

Dietzgen Union / 1772-B

Faber Castell / 2/82 Duplex

Faber Castell / 1/87A

Faber Castell / 375

Faber-Castell / 1/60/360 Mannheim

Faber Castell / 378 Electro

Flying Fish / 1001 Log-Log

Gebruder Wichmann / Three Scale

A. Lietz Slide Rule by Hemmi / 2974N

Hemmi / 64 Rietz

Hemmi / 255

Hemmi / 301A

Hemmi / 2664 Electrical Contractors

Hemmi / Model 1 Sold by Tamaya

Hemmi / 2664 Rietz

"Jackson Brothers, Leeds"

Davis-D&P / Log-O-Log

John Davis & Sons (D & P)

John Davis & Son (D&P) / Mannheim

K & E / Mannheim w/o number

K & E /4041 Mannheim with Magnifier

K & E /4053-3

K & E /4053-3F (Finely Divided)

K & E /4065T with Clamshell Cursor

K & E /4070-3

K & E /40701T

K & E /40701T with Clamshell Cursor

K & E /4083 Log Log Duplex Vector

K & E /4083-3 Log Log Duplex Vector

K & E /4088-3 Polyphase Duplex

K & E /4088-3 Polyphase Duplex

K & E /4088-3 Polyphase Duplex

K & E /4092

K & E /4092-3

K & E /4092-3

K & E /4095 Merchant

K & E / 4058C Beginners

K & E / Cox Duplex

K & E / Military

K & E / Universal

K & E / 9081-3 Log-Log Duplex Decitrig

Kolesch-Nestler / Triplex

Lalanne / Glass

Lilley / Boxwood Slide Rule

Micronta (Relay.Ricoh) / 150

Nestler / 20 Rietz

Nestler / 14

Pickett / 500T

Pickett / 1010ES

Pickett / Deci Point

Pickett / PR13 Projection

Post (Hemmi) / 1450 Versatrig

Post (Hemmi) / Versalog II

Post (Hemmi) / Versalog

Post (Hemmi) / 1447 (Occupied Japan)

Post (Hemmi) / Pre-WWII 1458

Precision Scale parts and partial slide rules

Relay / SIC 153

Relay Ricoh / SIC (Scientific Instrument Co.) 1570

Relay/Ricoh (Edmond Scientific) / 105

Sans & Streiffe / 311

Sans & Streiffe / 311

Tavernier Gravet / Mannheim

Tavernier Gravet / 25 cm

Unknown / Mannheim

UTO / 561

"UTO / 930 ""Studium"""

UTO /Gert-Schutz-Marine-Navigation

UTO / No. 1

"Harling, W. H. / Mannheim, Marine Navigation"

"Harling, W. H. / Mannheim"

W.F. StanleySheppard's Duodecimal Cubing

Weber / 4281-5


Aviation

APR / E6-3B Scrolling Wind Slide Flight Computer

American Airlines / Type C

Aristo / 647 Aviat Flight Computer

Aristo / 661 Naviat Navigation Computer

Felsenthal / MB-4 ( E6-B style)

Pocket / CPU-26A (E6B style)

Jeppesen / E6B-2A

Sanderson /SC-6 Flight Computer E-6B style)

Aircraft Navigational Computer / Mark 8

Drift Angle Computer Device / 1-CH-1

Dalton / E-6B


Electronic Calculators

APF / Mark VI Calculator

Casio / 450

Casio / FX-68 Calculator

Casio / FC-702P Calculator

Faber Castell / TR1

Heathkit / OC-1401 Flight Computer Calculator

K&E / 68 0800 Electronic Calculator

Monroe / Scientist Calculator

National Semiconductor / NOVUS 4525 Calculator

Qualitron / Calculator

Calcupen

Calcupen 2

Sears / Electronic Slide Rule Calculator

Wang / 360 Calculator

Wang / C-87 Calculator


Circular/Spiral

ALRO / 200 R

Alteneder and Sons / SEXTON's OMNIMETRE # 3 - Type II

American Hydromath / Coasting Computer & Cross Drift Detector (1)

American Hydromath / Pitch-Speed-RPM / Time-Speed-Distance (2)

Aristo / 623 Commerz III

Barron / Chandler?s Adding and Subtracting Scale

Blundell / NL 11-95

Carli / ROULETTE X (model B)

Computer Mfg. / ROSS PRECISION COMPUTER (Type I)

CONCISE / 28

CONCISE / 380 Radio Computer

CONCISE / 600-CE

CONCISE / HP 600-CE

CONCISE / LIETZ 3636 -25

CONCISE / RCA EE-112

CONCISE / SIC 300-B

CONTROLLER / NoName

Dempster / RotaRule - AA

FELSENTHAL / PSYCHROMETRIC CALCULATOR

FXR / Radio Transmission Line Calculator & Smith Chart

GE / 138 Electronic Countermeasures Calculator

GE / 188 Electronic Countermeasures Calculator

Gilson / Apex Type I

Gilson / Atlas Type II

Gilson / Atlas Type III

Gilson / Binary Type I

Gilson / Commercial Calculator

Gilson / Midget Type I - Version 2

Gilson / Midget Type VI - Version 1 (1 of 4)

Gilson / Midget Type VI - Version 1 (2 of 4)

Gilson / Midget Type VI - Version 1 (3 of 4)

Gilson / Midget Type VI - Version 1 (3 of 4)

Hexadaisy / HEXADAISY HEXADECIMAL CALCULATOR

LITHOCALCULATOR / Eckel Dial Rule

LOGA / Topo - Version 3

LOGOMAT / 2001 PfiffiKUS

Mascot / Tavella

PERRYGRAF / 15 inch Circular Slide Rule

PERRYGRAF / Cox Stadia 3100

PERRYGRAF / PERT-O-Graph

PERRYGRAF / Probability Slide Rule

PICKETT / 104-C Profit Calculator

PICKETT / LIETZ 3077

Schacht & Westerich / RECHENUHR - System Thomas

SIC / 1610 (Rotolog 400)

SIC / 1610-D (Rotolog 500)

Unknown / Simple Interest Rate

Weems & Plath / Tyler Slide Rule


Miscellaneous

A. G. Thornton Comprehensive Master scale template

Agfa 8x Loupe

Aristo IM1995 Gift Items

Bausch & Lomb 10x Loupe

Dietzgen Proportional Dividers

"Gerber 10"" Proportional Scale"

IBM Key Punch Alignment Template

Duboscq Arc Lamp

K&E Log Spiral Curve

Mamiya M645 Medium Format Camera

"Mills ""Vest Pocket"" Slot Machine"

Moonstick

Nikon 7x Loupe

Dietzgen Model 1887 Large Wooden Pantograph

SIC Poster / Catalog

Sekonic L-398A Studio Deluxe III Light Meter

Thorens Music Discs

Trill Steam Engine Indicator

Folding Yardstick

Balance Scale

Small brass magnetic compass

Small thread-counting microscope

The Universal Camera Lucida

"Spirule Co. ""Spirule"""

Weems & Plath Proportional Dividers



Planimeters

American Meter Co. Square Root Planimeter

Bushnell-Coffin

American Amsler

Amsler Type 3

Amsler Type 3

Amsler Type 6

Very early Amsler planimeter

Amsler Type 4

Amsler Type 4

Amsler Type 6

Amsler Type 4

Amsler Type 4

Amsler Type 2

Amsler Type 6

"W.F. Durrand Planimeter, by Amsler"

Amsler Type 3

Amsler No. 1 / K&E 4280 Integrator

Amsler 2003 / K&E 4294

Amsler Type 2 / Stanley P2331

Amsler Type 4 / Stanley P2334

Amsler Type 4 / Stanley P2334

"Amsler Type 6, Stanley P2341"

Amsler Type 7

Ashcroft Averaging Planimeter

Ashcroft Averaging Planimeter

Bailey Meter Co. Square Root Planimeter with Three Cams

Bailey Meter Co. Square Root Planimeter with Two Cams

Bowen 250A

Bowen Polar Planimeter

Special planimeter for chart records from type M
chart recorder for venturi meter

Bushnell Polar Planimeter

Bushnell Polar Planimeter

Coradi No. 35/I - K&E Model 4238

Coradi Rolling Spherical Planimeter

Coradi No. 5239 Precision Disc Planimeter

Coradi - Weber No. 4313

Coradi Polar Planimeter

Coradi Model 1734

Dennert & Pape Polar Planimeter

Dennert & Pape Polar Planimeter

Dennert & Pape Polar Planimeter

Dennert & Pape Model 294 Polar Planimeter

Dennert & Pape Polar Planimeter In the style of Amsler Type 3

Dennert & Pape Model No. 601

Dennert & Pape No. 590

E.O. Richter System Pregèl Hatchet Planimeter

Foxboro Averaging Planimeter

Foxboro Square Root Planimeter

The Lippincott Planimeter

Goodman's Patent Hatchet Planimeter

Willis Improved Planimeter

Willis Improved Planimeter

K&E Model 4211

K&E Model 4236

K&E Model 620022

K&E Model N4236

K&E Model 4215

K&E Model 62 0100

K&E Model 4230

K&E Model 4230

K&E Model 4212

K&E Model F 4236

K&E Model 4212

Lasico Model 123A

Lyth Pantograph Planimeter

Maho 599

Mechanical Specialties Planimeter

Mechanical Specialties Planimeter

Ott Quadratplanimeter

Ott Rolling Disc Planimeter

Ott Universal Planimeter

Dietzgen No. 1803 D / Ott Type 16

Ott Polar Planimeter for Dietzgen

Ott Square Root Planimeter for Barton 1A1 Charts

Ott For Weber No. 4304

Ott Polar Planimeter

Ott Polar Planimeter

Ott & Coradi Type 8

Sokkisha 3651-30

Starke & Kammerer

Hounsfield Planimeter

The Trill Planimeter

Charles Bruning model 4840

German-Made copy of Amsler Type 6

German-Made Polar Planimeter Similar to Amsler Type 2

"Hatchet Planimeter, Maker Unknown"

German-Made Polar Planimeter Similar to Amsler Type 1

"Brass Pantograph Planimeter, Maker Unknown"

German-Made Polar Planimeter Similar to Amsler Type 1

"Allbrit ""Sliding Bar"" Polar Planimeter"

"Allbrit ""Fixed Index"" Polar Planimeter"

"Allbrit ""Fixed Index"" Polar Planimeter"

"Allbrit ""Fixed Index"" Polar Planimeter"

Allbrit Radial Planimeter

Allbrit A8031 or Q59

"Allbrit A8220, A8221, or A8222"

Allbrit Fixed Arm Planimeter

Stanley A8730 Harmonic Analyzer

The Willis Planimeter

The Willis Planimeter

Japanese Copy of Amsler Type 4


Pocket rules

Aristo / 867U

Aristo Piccolo / 816

Aristo / Puck - Hemmi / 1441 - Faber / 389

Faber Castell / 67-98 Rb Addiator

Faber Castell / 67-87

Keuffel & Esser /4061

Keuffel & Esser / 4088-2

Keuffel & Esser / 4097 B

Keuffel & Esser / 4181-1 Log Log

Keuffel & Esser / 9068 Doric

Nestler / 0121

UNIS / Marc

IML Motor Lines Slide Rule


Slide Adders

"Addiator Arithma, Aluminum"

"Addiator Arithma, Brass"

Addiator Negativ

Gray Arithmometer

Omega 9-Column Slide Adder

Produx 8-Column Slide Adder

Produx Large 8-Column Slide Adder

Stima Adding Machine

Six Slide Adders

Five Slide Adders

Four Misc. All-Metal Slide Adders

Six Cheap Slide Adders

Six Classy Slide Adders

Three All-Metal Slide Adders