Tina's Circular Slide Rules

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Abaci

Fearn's and Mear's Calculators

Circular Slide Rules

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Mechanical Calculators

Blundell

British Thornton

Aristo

Faber-Castell

Hemmi

Slide Charts

Measuring Devices

Slide Rule Books

Electronics

Drawing Instruments

Aero Products CR-4

Aero Products Research, Time Speed Distance slide rule in the form of a Money Clip.

Alro 55-Nmmi. For Multiplication, Division and conversion between Inches and Centimetres

Alro 200R

Alro 300D

Alro 600E

Alro 1010, Commercial. From the estate of a former agent for Alro in Switzerland.

Alro Discabois System J.L.Brouhon

Blackburn Beverley C.A.R.P (Computed Air Release Point) Calculator

Blackwell Average Speed Calculator, Blackwell's Metallurgical Works Ltd., Thermetal House, Garston, Liverpool 19. Made By Abbott Brown, Beaminster.

Bonwitt Slide Rule

BPB Instruments Resistivity Salinity Calculator

Breitling Circular Slide Rule used to show owners of Breitling Watches how the Slide Rule Bezel on their Watch functions. Its Quality and its Accuracy are Appalling.

British Railways Board Volume / Weight Calculator BR 1497

Circulator. Circulator Co. Ltd. London, N.W.9.

Concise, Imported and Supplied by Dargue Bros. Ltd. Halifax. This rule looks like an old version of the Concise 28. Dargue Brothers were the Manufacturers of the Simplon series of Slide Rules.

Concise 28N advertising Time-Life Books

Concise 32

Concise 270N

Concise 300

Concise 380 Radio Computer

Concise 740 English-Metric Converter, Concise Co.Ltd, 2-16-23 Hirai, Edogawa-ku, Tokyo, Japan.

Concise Stadia Slide Rule

Concise Sama and Etani 200 EE Advertising Brown and Root Inc

Concise Sama and Etani CTCS-552 Advertising Dowell Schlumberger

Concise Sama and Etani DA-1 Especially Designed with inserts for Dresser Atlas

Concise Sama and Etani Model NL-1 Advertising Baroid

Concise Weights and Measures Conversion Tables Type E

Concise Sama and Etani Radiological Tables and Circular Slide Rule

Concise Sama and Etani 1000 with an Addiator on the back.

Concise Sama and Etani Model 600 with a Periodic Table of the Elements on the back.

Concise Sama and Etani Model 600 with a Periodic Table of the Elements on the back with Insert CE. Property of U.S Government, 7520-00-926-2021, Slide Rule Type III Class 3

Controller Mod. 200R

Corona 1

Dalton Dead Reckoning Computer

G. Felsenthal & Sons. Chicago, Nautical Slide Rule, u.s.Navy Bureau of Ships, Manufacturer's Part No. FNS-3.

GC Profit Calculator.

Dietzgen Gilson Circular Slide Rule

Gilson Binary Circular Slide Rule, 8.5" in diameter.

Fowler's Junior Type 4MJRG1 in Richard Blankenhorn and Robert de Cesaris' Catalogue Raisonne)

Garbutt-Hatch Calculator

Golding Horse Power Computer for Steam Engines. Publishers, Charles Griffin & Co. Ltd. Exeter Street, Strand, London W.C. 1908

Hall's Clock Variations Calculator.

American Hydromath Co. Time-Distance-Speed Computer, Pitch-Speed-RPM Computer, Coasting Computer and Cross Drift Detector.

Isotope Handling Calculator Mk III. Made by Abbot Brown of Beaminster, Dorset, Makers of Engraved and Printed Scales including Slide Rules and Rulers.

Johnson and Phillips Ltd. Capacitor (kVAr) Calculator.

Kane Dead Reckoning Computer, Model MK-6B, Copyright 1957 Kane Aero Co. St.Paul, Minnisota.

Lee Sheet Steel Weight Calculator. Made by Smiths Calculators of Beaminster, Dorset.

Lovelace Nuclear Bomb Effects Computer.

Macbeth Illumination Calculator, Copyright in the United States and Canada, 1908, Copyright 1808 by Norman Macbeth. The Calculator includes scales for Horizontal and Vertical Illumination Angles, Normal Illumination Angles and Angles Determined by D/H. Norman Macbeth was the founder of the Macbeth Artificial Daylighting company in 1915, a company which still exists as a subsidiary of X-Rite Incorporated. Artificial Daylighting will be important to those Slide Rule Collectors (not me) who create high quality images of slide rules.

Maclean's Finance Calculator.

Memorex Magnetic Tape Calculator.

Norma Grafia 190, Germany

NRK-2

Dutch version of the Nuclear Bomb Effects Calculator

Perrygraf P200-10 Slide Rule advertising Carrier Air Conditioning Co. Syracuse, New York.

Pickett 101-C Lietz No.3625-10 Dial Rule

W.G.Pye & Co.Ltd RAF Course and Speed Calculator Mk IIA Serial No. 2095/39

Rota Easy Read Slide Rule, Instrumental Devices Ltd. London W.1.

Smith Chart

FXR Inc. Smith Chart and Circular Slide Rule

Water Flow Calculator for Staveley Spun Cast Iron Pipes.

Stephanus Computer for Vee Rope Drives.

Tina's Nystrom. Circular Slide Rule based on my guess concerning Nystrom's Calculator Design.

Tina's Logarithmic Spiral Slide Rule. The top picture shows the setting for the multiplier 8 in the sum 8 x 6. The lower picure shows the answer on the leftmost cursor. Read both the multipliers and the results on the linear scales on the cursors not on the spiral.

Calculator Downwind Toxic Vapor Hazard, Point Source, ABC-M2

K.Emil Troger, Mylaui.V., DRGM 227046.

Victor Fuel load Calculator for the Handley Page Victor B Mk.2 Supersonic Strategic Bomber

Weems and Plath Nautical Slide Rule 105

Young's Course Corrector. Designed by Walter Young, M.Inst. P.I.

Zambretti Weather Forecaster from Temeraire of Brixham.

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