Gizmos by Category

Sinclair Stuff

Cameras & Optical

Clocks Watches Calcs

Computers & Games

Geiger Counters & Atomic Stuff

Miscellaneous & Oddities

Phones & Comms

Radio & Audio

Tape Recorders & Players

Test & Scientific Instruments

TV & Video

 

Psst...looking for cheap 

nuclear stuff?

Gizmos A - Z

15-station Desk Intercom

Academy 'Camcorder' Radio

Academy YWT 14 Walkie Talkies

Accoson Sphygmomanometer

Acos SLM3 Sound Level Meter

Acoustic Coupler

Advance PP5 Stabilised PSU

Aibo ERS-111 Robotic Pet

Aiwa LX-110 Linear Turntable

Aiwa TP-32A Tape Recorder

Alba PTV-11 Mini TV Clock Radio

Alcatel Minitel 1 Videotex

Aldis Folding Slide Viewer

Alpha-Tek Pocket Radio

Airlite 62 Military Headset

Airlite 71 Aviation Headset

Aitron Wrist Radio

Aiwa TP-60R Tape Recorder

AKG K290 Surround 'Phones

Amerex Alpha One Spycorder

Amstrad em@iler

Amstrad NC100 Notepad

Amstrad VMC-100 Camcorder

AN/PRC-6 Walkie Talkie

Apple Macintosh SE FDHD

Amstrad CPC 464 Computer

AlphaTantel Prestel

Archer Realistic Headphone Radio

Astatic D-104 Desk Microphone

Atari 2600 Video Game

Atari 600XL Home Computer

Audiotronic LSH 80 'Phones

Avia Electronic Watch

Avid Pneumatic Headphones

AVO Multiminor

AVO Model 8 Multimeter

Bambino Challenger Radio

Bandai Solar LCD Game

Barlow Wadley XCR-30 Radio

BC-611/SCR-536 Handy Talkie

B&O Beocom 2000 Phone
B&O Beolit 609 EXP II AM Radio

Baygen Freeplay Lantern

Bellwood, Bond Spycorder

Benkson 65 LW/MW Radio

Benkson 68 Mini Tape Recorder

Benkson 79 Mini Tape Recorder

Benkson 92 Baby Sitter Alarm

Betacom BF1 Pianotel Phone

Betacom CP/6 Ferrari Phone

Bigston PS-5 Flat Panel Speakers

Binatone Digivox Alarm

Binatone Long Ranger 6 CB

Binatone Mk6 Video Game

Binatone Moontime Clock Radio

Binatone Worldstar Radio

Binotone Radio Binoculars

Bio Activity Translator

Biri-1 Radiation Monitor

Blick Time Recorder Clock

Bolex Paillard 155 Cine Camera

Bowmar LED Digital Watch

Boots CRTV-50 TV,Tape, Radio

Beseler PM2 Color Analyzer

British Gas Mk 2 Multimeter

Brolac Camera In A Can

Brydex Ever Ready Lighter

BSB Squarial

BT CT6000 Moneybox Payphone

BT Genie Phone

BT Kingfisher Answering Machine

BT Linesmans Phone 282A

BT Rhapsody Leather Phone

BT Slimtel 10 HT2A

Bush TR 82C MW/LW Radio

Cambridge Z88 Computer

Candlestick Telephone

Canon Ion RC-260 Camera

Cartex TX-160 Multiband Radio

Casio VL-Tone Keyboard

CD V-700 Geiger Counter

CD V-715 Survey Meter

CDV-717 Survey Meter

CD V-742 Pen Dosimeter

Casio CA-90 Calculator Watch

Casio WQV-1 Camera Watch

Central C-7980EN Multimeter

Channel Master 6546

Chinon 722-P Super 8 ciné

Citizen Soundwich Radio Watch

Citizen ST555 Pocket TV

Clairtone Mini Hi Fi Radio

Clarke & Smith 1069 Radio

Clipper TC-300 Tape Recorder

CocaCola Keychain Camera

Coke Bottle AM Radio

Commodore 64 Home PC

Commodore PET 2001-N

Companion CR-313 Walkie Talkies

Computer Novelty AM/FM Radio

Compact Marine SX-25

Concord F20 Sound Camera

Connevans LA5 Loop Amplifier

Coomber 393 Cassette Recorder

Coomber 2241-7 CD Cassette

Contamination Meter No.1

Cosmos Melody Organ

Craig 212 Tape Recorder

Craig TR-408 tape recorder

C-Scope ProMet II Detector

Dansette Richmond Radio

Daiya TV-X Junior  Viewer

Dancing Coke Can

Dawe Transistor Stroboflash

Decca RP 205 Record Player

Decimo Vatman 120D Calc

Diamond Rio Media Player

Dictograph Desk Phone

Direct Line Phones x2

Dokorder PR-4K Mini Tape

Dosimeter Corp MiniRad II

DP-66M Geiger Counter

DP-75 Geiger Counter

Duvidal FT-66 Tape Recorder

Eagle Ti.206 Intercom

Eagle T1-206 Intercom

Eagle International Loudhailer

EhrcorderTP-421 Tape Recorder

Electrolysis Cell

Electron 52D Spycorder

Electronicraft Project Kit

Eddyprobe II Integrity Tester

Ed 'Stewpot' Stewart Radio

EMS Stammering Oscillator

Ericsson Ericofon Cobra Phone

Estyma Travel Radio Alarm

Etalon Luxor Light Meter

Euromarine Radiofix Mk 5

Exactus Mini Add Calculator

Fairylight Morse Set

FEP Microphone & Earphone

Ferguson 3247 Tape Recorder

Ferguson FC08 Camcorder

Ferguson FHSC 1 Door Cam

Fi-Cord 101 Tape Recorder

Fi-Cord 202 Tape Recorder

Field Telephone Set J

Fidelity HF42 Record Player

Fisher-Price 826 Cassette

Fleetwood Globe AM Radio

Fonadek Telephone Amplifier

Franklin LF-390 Guitar Radio

Gaertner Pioneer Geiger Counter

G&E Bradley CT471C Test Meter

Garmin GPS III Pilot Satnav

GE 3-5805 AM CB Radio

GE 3-5908 Help CB Radio

GEC C11B2 Electricity Meter

GEC Sashalite Photoflash

GEC Transistomatic

GEC Voltmeter

General Radiological NE 029-02

Gfeller Eiger Phone

Giant Light Bulbs

Giant Watch-Shaped  Radio

Goodsell TC Record Player

Gowlland Auriscope

GPO Headset No. 1

GPO Keysender No 5

GPO RAF Microphone No. 3

GPO Telephone Series 300

GPO Telephone Type 746

GPO 12B/1 Test Meter

GPO Trimphone

GPO Ring Microphone No 2

Gramdeck Tape Recorder

Grandstand Astro Wars

Grandstand Video Console

Grundig EN3 Dictation

Grundig Melody Boy 1000 Radio

Grundig Memorette

Grundig TK-141 Tape Recorder

Grundig Yacht Boy 210 Radio

Guy's Britannic Calculator

H&G Crystal Radio

Harrier Pilot AM/FM/Air Radio

Hacker Radio Hunter RP38A

Hacker Radio Mini Herald

Hanimex Disc Camera

Harmon Kardon HK2000

Harvard Batalion Radio

Heathkit GR-70 Multiband Radio

Heathkit Oxford UXR2 Kit Radio

Heathkit Thermo Spotter MI-104

Henica H-138 Radio Lighter

Hero HP-101 Intercom

Hitachi MP-EG-1A Camcorder

Hitachi TRK-8015 Cass Recorder

Hitachi WH-638 Radio

Hitachi VM-C1 Camcorder

HMV 2210 Tape Recorder

Hohner 9806 Organetta

Homer KE-10 Intercom

Homer KT-505 Phone Amplifier

Homey HR-408 Recorder

Horstmann Pluslite Task Lamp

Hy-Line 110 Clock Radio Phone

Ianero Polaris Spotlight

Ingersoll XK505 TV, Radio

Intel QXP Computer Microscope

Interstate Video Game

International HP-1000 Radio

Internet Radio S-11

IR Binoculars No 1 Mk 1

ISI Rapid Abnormality Indicator

Isis RADIO AM radio

ITT KB Super AM/FM Radio

Ivalek De Luxe Crystal Radio

James Bond TV Watch

Jasa AM Wristwatch Radio

Juliette LT-44 Tape Recorder

Jupiter FC60 Radio

JVC GR-C1 Camcorder

JVC GX-N7E Video Camera

JVC HR-C3 VHS-C VCR

JVC HR-3300 VHS VCR

King Folding Binoculars

Kodak Brownie Starflash

Kodak 56X Instamatic

Kodak 100 Instamatic

Kodak Disc 6000

Kodak EK2 'The Handle'

Kodak EK160 Instant Camera

Kodak Pony 135

Koss ESP-6 Headphones

Kvarts DRSB-01 Dosimeter

Kvarts DRSB-88 Dosimeter

Kvarts DRSB-90 Geiger Count

Kyoto S600 8-Track Player

Labgear Handi-Call Intercom

Lamie 2-Transistor Boys Radio

La Pavoni Espresso Machine

Le Parfait Picture Frame Radio

Linwood SImple Siren Car Alarm

Ludlum Model 2 Survey Meter

Macarthys Surgical AM Radio

Magma Fumalux FL400 Lighter

Magnetic Core Memory 4kb

Maplin YU-13 Video Stabilizer

Marlboro Giant  AM Radio

Mattel Intellivision

Maxcom Cordless Phone

McArthur Microscope OU

Mehanotehnika Iskra Intercom

Memo Call Tape Recorder

Merlin Hand-Held Game

Microflame Model B Blowtorch

Micronta 22-195A Multimeter

Micronta 3001 Metal Detector

Micronta S-100 Signal Injector

Micronta VoxWatch Voice Watch

Microphax Case II Fiche

Midland 12-204 Tape Rccorder

Military Headset 5965-99-100

Mini Com Walkie Talkies

Mini Instruments 5.40 Geiger

Mini Instruments 6.20 Mini Assay

Minidyne Mk II TENS Machine

Minifon Attaché Tape Recorder

Mini-Z Electro Thermometer

Minolta 10P 16mm Camera

Minolta-16 II Sub Min Camera

Minolta XG-SE 35mm SLR

Minolta Weathermatic-A

Minox B Spy Camera

Modernage Bookcorder 405

Mohawk Chief Tape Recorder

Monatone D 5151 AM Radio

Motorola 5000X Bag Phone

Motorola 8500X ‘Brick’

Motorola Micro TAC Classic

MPMan MP-F20 MP3 Player

Mullard OC Transistors

Music Man Talking Radio

My Power Megaphone

Mystery Microphone

Nagra SN Tape Recorder

National Hyper BII Flashgun

 

Widget Of The Week

Evershed & Vignoles Series 3 ‘Wee’ Megger, 1960?

Testing the insulation of wires and cables isn’t as common as it used to be in days gone by, for the simple reason that it isn’t as much of a problem as it used to be. That’s mainly due to vast improvements in insulating materials, stricter standards and more consistent manufacturing techniques, but when electrical insulation fails -- as it does -- sparks fly and very bad things can happen…

 

Testing electrical insulation is not as straightforward as you might think. The low voltages that most common or garden multimeters use to measure electrical resistance simply don’t cut the mustard when checking the integrity of cables that may be called upon to carry several hundred volts. You need something with a bit of muscle, and that’s where test instruments, generically known as ‘Meggers’ come in. They’ve been around for almost as long as cables have carried electricity, since the late nineteenth century, and Evershed & Vignoles Ltd, of Acton Lane in Chiswick, London, who made this Series 3 Megger, have been in the insulation testing business since the very beginning. We’ll come back to their story a little later on. 

 

One of the two key components in any Megger is a high voltage generator that can expose otherwise invisible weaknesses and flaws in a cable’s insulation layer, that a low voltage test would miss. In the Evershed and Vignoles Series 3 it comes from a hand-cranked dynamo that puts out a steady 500 volts. Legend has it they’ve been used for less benign applications, such as instruments of torture, but we needn’t dwell on that… The other important element in a Megger is the meter, which gives an indication about the effectiveness of a cable’s insulation layer, measured in thousands and millions of ohms. As a matter of interest this Series 3 Megger is a high-resistance model, with the meter scaled from zero to infinity ohms; other Series 3 models were also produced, configured for lower or narrow resistance ranges.

 

There are no controls as such and to use it for simple insulation testing a pair of probes is connected to spring loaded terminals on the sides of the case. The positive (red) probe goes to the cable’s inner conductor and the black probe connects to Earth, or the metal chassis of the equipment being tested. The idea is to crank the handle at around 160 turns a minute, for one minute, whilst noting down the reading on the meter. In general very high to infinity is often a good result; anything less might suggest a problem, though the engineer carrying out the test should know beforehand what sort of reading to expect. Cranking speed and hence the output voltage is kept reasonably steady by a centrifugal clutch on the dynamo, that helps the user to maintain a steady rhythm. 

 

The Series 3 model is a real old timer and affectionately known by generations electrical engineers as the ‘Wee’ Megger. Production began in 1932 and lasted until the mid 1960s. Over the years the only significant changes to the design, in the late 1940s, was to switch to an AC generator. Along with a rectifier circuit and capacitors it provided a more stable test voltage. This one I found at a car boot sale around 10 years ago; I am fairly sure it only cost £2 or £3, thanks to the stallholder having little or no knowledge of what it was. The generator handle turned easily and the general condition was very good, which suggests it had seen little use and was one of the later models, probably dating from the early to mid 1960s. It is housed in a crack-free Bakelite case. This is a tough thermo-setting plastic that can survive all but heaviest drops and blows. It only required some light cleaning to get it into near showroom condition. Fortunately there’s very little to go wrong and after a little light lubrication it proved convincingly that it was still working by giving me a lively jolt, whilst poking around inside the case and unwisely giving the handle a few experimental turns…

 

What Happened To It?

The story begins in 1888 when Sidney Evershed and Ernest Vignoles were both working for Goolden and Trotter, a UK company making test equipment and dynamos for the telegraph and mining industries. Evershed was a talented engineer and responsible for many technical refinements. In 1895 Evershed teamed up with Ernest Vignoles, a director of Goolden and Trotter. Together they purchased the company’s instrument division to set up their own business, using their expertise and marketing savvy to make test instruments. Production of insulation testers started in 1903 and in the same year they registered the Megger name and trademark. Evershed and Vignoles made Meggers with hand generators until well into the 1980s. However, they kept up with developments in technology and in the early 1960s were one of the first to market a battery powered Megger, using a transistorised high voltage generator.

 

Over the years ownership of the company changed several times, most recently in 1986 when it was acquired by AVO. They were then, and still are, a leading maker of test instruments and shortly after the buy-out they re-branded themselves as Megger Instruments Ltd. High performance insulation test instruments still feature prominently in the company’s extensive product range.

 

Aside from a small number of specialist collectors, workaday test instruments – in their original state – tend to attract little interest, but there are exceptions. Vintage test instruments, especially if they are in wooden cases and have lots of shiny brass fittings and trim, are popular. Sadly a lot of them are ‘up-cycled’ into daft looking table lamps, or worse still, stripped of parts for Steam Punk contraptions. Series 3 Meggers are somewhat dull looking and until now have largely escaped this terrible fate. They were made in quite large numbers and at the time of writing (mid 2021) there is usually half a dozen or more of them on ebay at any one time, typically selling for between £10 and £30, depending on the condition. I have, however seen several half hearted table lamp conversions using a series 3, but it’s not a pretty sight. Nevertheless makers and sellers seem pleased with their efforts and clearly feel they are worthy works of art. One example I spotted at a large Midlands antique fair recently, had a £120 price tag…


DUSTY DATA

First Seen:                   1932

Original Price:             £?

Value Today:               £20 (0621)

Features:                     Hand-cranked DC generator with centrifugal clutch speed governor, 500 volts test supply, twin coil, moving coil meter, zero to infinity logarithmic scale, spring terminals for test leads

Power req.                     Integral DC generator

Dimensions:                   137 x 100 x 64mm                                         

Weight:                          1.6kg

Made (assembled) in:     England

Hen's Teeth (10 rarest)    6



Web

dustygizmos

Dusty Navigation

About Dustygizmos

Crystal Radios

Transistor Radios

Mini Tape Recorders

Spycorders

Sinclair TVs

Manuals

Tape Recorder Gallery

A - C    D- M     N - Z

 

 

 

 

 

 

 

More Gizmos A - Z

National RQ-115 Recorder

National Panapet AM Radio

National Standphone Intercom

National Toot-A-Loop Radio

National WH-106 Hearing Aid

Nattax Dental Outfit

NatWest 24 Hour Cashcard

Nife NC10 Miner's Lamp

Nikkai VW58 Mini TV

Nimslo 3D Camera

Nivico JVC TR-514U Recorder

NOA FM Wireless Intercom

Nokia 9210 Communicator

Novelty AM Radio Piano

Nuclear Enterprises PDM1

Nuclear Enterprises RM5/1

Nytech CTA-252XD Tuner-Amp

Olympia DG 15 S Recorder

Onkyo PH-747 Headphones

Opax Stereo Microscope

Optikon Binocular Magnifier

Oric Atmos Home PC

Panda & Bear Radios

Panasonic AG-6124 CCTV VCR

Panasonic EB-2601 Cellphone

Panasonic Toot-A-Loop Radio

Panasonic RP-8135 Mic

Panasonic RS-600US

Parrot RSR-423 Recorder

Penguin Phone PG-600

Penncrest Tape Recorder

Pentax Asahi Spotmatic SLR

Perdio Strand PC44 AM Radio

Philatector Watermark Detector

PH Ltd Spinthariscope

Philips 13RF833 Turntable

Philips CD 150 CD Player

Philips Electronic Kit

Philips EL3302 Cassette

Philips EL3586 Reel to Reel

Philips GF300 Record Player

Philips N1500 VCR

Philips N4308 Tape Recorder

Philips PM85 Recorder

Philips P3G8T/00 Radio

Philips VLP-700 LaserDisc

Philips SBC RU 098 TV Remote

Phonotrix Model 1 Recorder

Pifco 888.998 Lantern Torch

Pion TC-601 Tape Recorder

Pioneer Hawaiian Phonograph

Playcraft Bandbox Microphone

PL802/T Semconductor Valve

Plessey PDRM-82 Dosimeter

Polaroid Automatic 104

Polaroid Land Camera 330

Polaroid Supercolor 635CL

Polaroid Swinger II

Polavision Instant Movie

POM Park-O-Meter

Prinz 110 Auto Camera

Prinz Dual 8 ciné Editor

Prinz TCR20 B&W TV

Promax GV-298 Pattern Gen

Psion Series 3a PDA

Psion Organiser II XP

Pulvelec Cabinet Battery

Pye 114BQ Portable Radio

Pye Q6 Two-Band Radio

Pye TMC 1705 Test Phone

R2D2 Lazerbuilt Novelty Phone

Quali-Craft Slimline Intercom

Rabbit Telepoint Phone

RAC Emergency Telephone

Racal Acoustics AFV Headset

Radio 1 FM Number One Radio

Radofin Triton Calculator

Raytheon Raystar 198 GPS

Realistic PRO-62 Scanner

Realistic TRC 209 CB

Realistic TRC-503 Transceiver

Rene Meyer Headphones

Renown 402 Tape Recorder

ReVox A77 Tape Recorder

Roberts R200 MW/LW Radio

Rolling Ball Clock

Rolls Royce Car Radio

Ronco Record Vacuum

Royal/Royco 410 Recorder

Runbaken Ardwick Batt Test

Sanritsu Memotape TC-5

Sanyo G2001 Music Centre

Sanyo Memo-Scriber TRC-7040

Sanyo MC-1/1A Mini Recorders

Sanyo MR-115 Tape Recorder

Sanyo M35 Micro Pack

Satellite AM/FM Radio

Satvrn TDM-1200 Sat Box

Science Fair 65 Project Kit

Seafarer 5 Echo Sounder

Seafix Radio Direction Finder

Seiko EF302 Voicememo

Seiko James Bond TV Watch

Sekiden SAP50 Gun

S.G. Brown Stick Earphone

Shackman Passport Camera

Sharp CT-660 Talking Clock

Sharp RD-303E Tape Recorder

Shira WT106 Walkie Talkies

Shira WT-605 Walkie Talkies

Signal Corps BC-11 GI Phone

Shogun Music Muff

Silma 120M Projector

Simpson 389 Ohmmeter

Sinclair Calculator

Sinclair Black Watch

Sinclair FM Radio Watch

Sinclair FTV1 Pocket TV

Sinclair Micro-6 Radio

Sinclair Micro FM Radio

Sinclair Micromatic Radio

Sinclair Micromatic Kit (Unbuilt)

Sinclair Microquartz Clock

Sinclair MTV1A Micovision TV

Sinclair MTV1B Microvision TV

Sinclair PDM-35 Multimeter

Sinclair System 2000 Amp

Sinclair Super IC-12

Sinclair X1 Burtton Radio

Sinclair Z-1 Micro AM Radio

Sinclair Z-30 Amplifier

Sinclair ZX81

Smiths ECS Process Timer

Smiths SR/D366 Gauge Tester

Snooper Geiger Counter

Speak & Spell

Spirit Of St Louis Radio

Sony Betamovie BMC-200

Sony CFS-S30 'Soundy'

Sony DD-8 Data Discman

Sony CM-H333 Phone

Sony CM-R111 Phone

Sony Mavica FD7 Digital Camera

Sony FD-9DB Pocket TV

Sony M-100MC Mic'n Micro

Sony MDR3 Headphones

Sony MVC-FD71 Digicam

Sony SL-C7 Betamax VCR

Sony ST-80F AM/FM Tuner

Sony TC-50 Recorder

Sony TC-55 Recorder

Sony TR-55 Camcorder

Sony TR1819 Cube AM Radio

Sont TR1829 AM Radio

Sony Walkman TPS-L2

Sony Rec Walkman WM-R2

Spectra Radio Spectacles

Speedex Hit Spy Camera

Standard Slide Rule

Standard SR-V07 Miniature TV

Standard Radio Unicorder 61

Starlite Pocket Mate Tape

Staticmaster Static Brush

Steepletone MBR7 Radio

Stella ST415T MW/LW Radio

Stellaphone ST-456 Recorder

Stuzzi 304B Memocorder

Stylophone

Swatch The Beep Pager

Swatch G700 (GIant Model)

Talkboy Tape Recorder

Tamrom Fotovix TF-56WE

Taylor Barograph

Tasco SE 600 Microscope

Teacup Novelty AM Radio

Technicolor Portable VCR

Telephone 280 1960

Telequipment Servicescope

Telex MRB 600 Headset

Teltape Mini Tape Recorder

Thorn Radiacmeter

Thunderbirds AM Can Radio

Tinico Tape Recorder

TOA CC-1200 CCTV Camera

Tokai TR-45 Tape Recorder

Tomy Electronic Soccer

Tohphonic HP-2T Intercom

Toshiba HX-10 MSX Computer

Toshiba Libretto 50CT Mini PC

TR Gooseneck Microphone

Triumph CTV-8000 5-inch TV

TTC C1001 Multimeter

Uher 400 RM Report Monitor

UT-66 Video Sender

Vanity Fair Electron Blaster

Vextrex Video Game

Victoreen 471 Survey Meter

Videomaster Superscore VM8

VideoPlus+ VP-181 Remote

Vidor Battery Radio

View-Master Stereo Viewer

Viking Sol Invictus Metal Detector

Vivalith 301 Heart Pacemaker

VTC-200 Video Tape Cleaner

Waco Criuser AM Radio

Waco TV Slide Lighter

Wein WP-500 Flashmeter

Wallac Oy RD-5 Geiger Counter

Weller X-8250A Soldering Gun

W E Co Folding Phone

White Display Ammeter

Wittner Taktell Metronome

Wondergram Record Player

Yamaha Portasound PC-10

Yashica AF Motor 35mm

Yupiteru MVT-8000 Scanner

Zeon T-800 Video Game

`

All information on this  web  site  is provided as is without warranty of any kind. Neither dustygizmos.com nor its employees nor contributors are responsible for any loss, injury, or damage, direct or consequential, resulting from your choosing to use any of the information contained  herein.

Copyright (c) 2006 - 2021 dustygizmos.com

 

 

counter statistics