The Turn Of The Century
Electrotherapy Museum
Forgotten Tesla Technologies
 
                       http://www.electrotherapymuseum.com
 1897 Tesla Oscillator Reproductions
 Large 1897 Oscillator Reproduction
 Tesla's 1897 Unipolar X-Ray Tube Experiment
 Prototype Flaming White Arc Coil
 Behary Flaming White Arc Coil
 Flaming Arc Stills Gallery
 St. Elmos Fire Gallery
Saint Elmo's Fire 27 Feb 2005
 Bipolar St. Elmos Fire Gallery
 Behary d'Arsonval Coil Reproduction:
 Battery Operated Tesla Coil
 Tesla Lecture Reproduction:  Discharges
 Through 2" Plate Glass
 Behary-Kinraide-Jackson Coil Reproduction
 Behary-Kinraide-Jackson Discharges
 Early Prague Coil Testing
 Pre-Installation Of Prague Coil
 Prague Coil In Operation Gallery
 Physician's Cabinet
 9" Pancake Coil Gallery
 Thomas Stanley Curtis Kicking Coil Reproductions
 50W Baby Prague Coil
 Kicking Coil Apparatus
 Bipolar Kicking Coil Gallery
 Special Interrupters For Induction/Kicking Coils
 Rochefort-Wydts Experiments
 Large Pancake Coil Winding Jig
 Pancake Magnifier System
 Details Of Pancake Coil Construction
 Misc. Pancake Photos
 Behary Style Tesla Coils
 Behary Misc. Items
 Behary Style Spark Gaps
 Tesla Coil Schematics

Updates from 2006:

Prototype Strong-Ovington Apparatus:
Dr. Strong's Condenser Terminal's!
Prototype Strong-Ovington Apparatus
Testing Phase I...
Christmas Coils for Brian and Frank (and Jeff)
Secondary Coil for Strong-Ovington Apparatus


 
Curious Zig-Zag Discharges...
Adjustable Frequency Tesla Coil Power Supply
Testing a 16" Pancake Coil Galleryl


Movie 1 - Flat Spiral Coil - 16" Diameter

Movie 2 - Flat Spiral Conical Coil - 14" Diameter
 
Flat Spiral To Conical Coil - Testing a
Modified Form of Kinraide "Jackson Coil"
A Selection Of Early Tesla Coils and
Cross Sections Of Pancake Coils
Frank and his amazing Tesla Lamps!
Complete Half Size Tesla Induction Coil:
An interesting look at a classic forgotten
Tesla Coil design.
22 October 2006 Weekend Projects:
Floor Model Pancake Tesla Coil,
1890s Tesla High Frequency Induction Coil,
Prototype Flaming Arc Twin Pancake Coil
Half-Size Tesla Induction Coil
A bipolar Pancake Coil with the primary coil on the
inside.  Each half of the primary has 25 turns, each
secondary coil has 120 turns.  Discharge is over 4"
.
Happy Birthday Nikola Tesla!
Long Island New York Photos!
Tesla "Pancake Coils": 
Redefining Tesla Technologies
Arcing Pancakes - Testing Phase I
Machined from scratch in two days...a bipolar Tesla /
Kinraide Coil modified for low voltage high current
outputs.

Kinraide Reproduction Electrode:
Point / Limitless Plane Electrode


In particular, note the following discharges:
TCFSparks1:  Point is even with the surface of the plane
TCFSparks2:  Point is retracted inside of plane
TCFSparks3:  Point is protruding from plane
Huge Quenched 5-Series Spark Gap
Campbell D Restoration:  Cast Knobs
Electrotherapy Museum Name Plates
Gigantic 16-Series Quenched Spark Gap
August 2006 Sparks
Rita is away so I made some noise and photographed
the two Tesla Coils below in action at night...
8" Twin Pancake Tesla Coil
Operated with a 10kV 23mA Neon/OBIT Transformer,
.01 Mica Transmitting Capacitor, and 4-Series
Reproduction Osborn Spark Gap (originally made by
H. G. Fischer for Thompson Plaster Cabinets)
7" Twin Pancake Tesla Coil with 2900 BPS
Rotary Break - 50-100W, 9" maximum
discharges!
Movie of Twin Pancake Tesla Coil
100 Watt Twin Pancake Tesla Coil
with Rotary Spark Gap - 8" Discharges!
Pancake Tesla Coil Operated with Carpentier Style Interrupter:  Electric Autographs

This coil was producing snake-like strobing negative discharges 4-5" long, interposed with very distinct branching positive discharges 3" long.  Current consumption:  100 watts at 110VAC.
4th of July Fireworks Kinraide Style:
Electric Discharges:  Snakelike Streamers &
Branching Discharges

    1.  On 8x10 Paper                 2.  On X-Ray Film
Lichtenberg Figures in Crookes vacuum
These figures are unfortunately unclear due to the near
impossible circumstances of trying to photograph them -
they were created using a burned out Edison bulb with
a straight filament.  The filament heavily bombarded
was spinning around the tube, and when it hit the glass
formed rapid moving Lichtenberg Figures.

      1.  Images                               2.  Movie
Gaiffe Gallot Mercury Interrupter
Frank found a real gem here!  He won't tell me when he gets it up and running, because he knows I'll fly there and will never leave!!
Figure 1:  Tesla Oscillator
For Experimental Use
Tesla Patent 583,593:  Electric Circuit
Controller that charges the condensers
in parallel and discharges them in series
Figures 4 & 7:  Misc. Tesla Oscillators
with mechanical breaks
Tesla Oscillator for Ignition Purposes:
Patent 609,250
A Tesla Coil for igniting gas engines - a "Tesla" ignition coil.
Tesla Oscillator with Mercury Interrupter:
Patent 609,248

This patent utilizes a liquid-to-liquid "make", with an insulating
disk used to separate the liquids for the "break" duration. 
Tesla Oscillator with Mercury Interrupter:
Patent 609,24
7
This patent utilizes liquid-to-solid interruptions of a
centrifugal ribbon of mercury to make and break contact
with a fan blade.
Tesla Oscillator with Mercury Interrupter:
Patent 609,251
It's not perfect, but these still took forever to draw!
Tesla Oscillator For Producing Ozone
Here are some 3D renderings I made of a famous Tesla Coil.
18" Flat Spiral Coils
A weekend outdoors:  making coils and entertaining the cat.
Powerstats!
We've recently acquired 3 large 3-phase variable transformers. ("Variacs" type transformers, manufactured by Powerstat)
Divided they form 3 single phase autotransformers.  We need only
1 unit, the other two are FOR SALE!
Reproduction Thompson Plaster Spark Gaps
These gaps are unique in that they are stationary, yet adjustable through the use of a sliding arm that short circuits the number of gaps not wanted in the circuit.  They are ideal for voltages from 3,500 - 25,000V or more.
Virtual Reproduction Thompson Plaster Spark Gap
High Energy Research Acquisitions...
1000 pounds of new components...including a massive
570 pound 25kV capacitor (.046 mfd - .460 mfd); an electro-
magnet with a 7.5" diameter x 24" tall core; some rather
unique d'Arsonval Coils...
Testing an 18" Pancake Coil
9600V 120mA Transformer; .046 mfd Condenser; 5-series
1/2" Tungsten Spark Gap; 18" OD 4" ID Pancake Coil:
One turn per layer, 21 AWG wire.


Movie:  Testing Phase I
Movie:  Testing Phase II

 
Violet Ray Coil Yielding 3-4" Sparks?!
With a normal Master Violet Ray Coil (operating under oil) I was able to get 3-4" sparks using my special adjustable condenser circuit.
3" Pancake Coil Testing:
Produces 2" - 4" Flaming Discharges.


Film of discharges (2.5 MB)

Film of "Dancing, Bursting Effluves"
and Flaming Discharges

Updates from 2007:

15kV Single Pancake Coil Test
15kV Bipolar Pancake Coil Test - 12"+ Discharges
From the family archive of Thomas Stanley Curtis!
Negative Discharges from Primary Coil to Tesla Ball Terminal
Thomas Stanley Curtis Reproduction - Small Oudin Resonator
Solid bakelite slab and simple handmade form.
Thomas Stanley Curtis Reproduction - A Classic Oudin Resonator
Produces a 12" discharge.  Made with hard woods, marble, silk-covered
wire, bakelite, brass, ...  the old-fashioned way!
Schematic of Tesla Coil For Producing Electric Phenomena
(Specifically designed for Pancake Coils)
Thomas Stanley Curtis Oudin Coil Reproduction
The most impressive cylindrical- secondary table-top Tesla Coil I have ever seen!
Solid State Low Voltage Tesla Coil :)
Okay not really.  A spark gap Tesla Coil operating with only a 240V transformer!
Phantom Streamers and Oscillatory Negative Discharges made
with a Tesla Coil using a wax-insulated output terminal
4" Pancake Coil for producing "Phantom Streamers"
Electrograph Showing Negative "Phantom" Streamers:
Faint discharges can be seen at the ends of the sparks extending
outward a distance of several inches
Original Kinraide Coil Test - Bipolar Arrangement
Original Kinraide Coil Test
A dedication to Thomas Stanley Curtis!
2KW Bipolar Wireless/X-Ray Tesla Coil tests...
Quenched Spark Gap Tests with Oudin Resonator
3/4" Tungsten Dual Quenched Spark Gap

"Stationary-Adjustable" Spark Gap


1.25" Diameter Tungsten Quenched Spark Gap #2


 
1.25" Diameter Tungsten Spark Gap!
Quenched Gap mounted to 6" aluminum heat sinks!
Bipolar Pancake Coil:  Using a Plate Capacitor for an
Adjustable Top Load
Eight Series Adjustable Binary Spark Gap:
From .001" - .254" in .001" increments!

The Tesla High Frequency Coil:  Its Construction And Uses (1910)
By:  George F. Haller and Elmer Tilling Cunningham

Virtual 12" Feature Tesla Coil


(I decided to do a 3D rendering of this coil until I get the chance to
actually build it...)
Testing a Prototype 9" Pancake Coil with Rotary Spark Gap:  Under Oil
Testing a Prototype 9" Pancake Coil with a Rotary Spark Gap
How to wind a simple form of Pancake Coil.
Photos of Pancake Coil constructions and apparatus...
9" Pancake Coil Test
Pancake Coil efficiency debate:  To the Tesla List
Tesla Inspired Induction Coil:  2" hot flames from a Model T Coil ran
directly from 220/240V mains!  No electronic ignition here! No circuit

board!  No soldering!  No transistors!!
Transformer-less Spark Gap Tesla Coil operated directly from 220/240V
mains!  Its possible - and here is proof and movie!
Weekend projects:
"Fitzgerald Pancake Coil": 8 Watt Tesla Coil giving 2 - 4" sparks!
Viracorp Violet Ray, Renulife Model K Violet Ray
My reproduction 1897 Tesla Oscillator has a new home
in Frank's collection!
 Kilowatt Pancake Coil stills
Homebrew Pancake Coil for Tesla Coil builders
"White Coils":  Pancake Coils for 12"+ discharges
15 kV Pancake Coil tests - round one.
Effluves and ionizations...
And sometimes they just SING!  9" discharges from a
9" Pancake Coil.
Gas Flame-like Discharge Experiments:
Curious effects of a 9" coarse wire Pancake Coil.
20V Tests:  Operating a Tesla Coil (with a spark gap!)
at low voltage, less than 200 volts on the output of the
(normally 1000V) high voltage transformer!

 
Testing a 3" Pancake Coil.  A Pancake Coil built of modern
materials:  PVC, Drywall Seam Tape, Wax Toilet Rings,
Brass Tubing, and a 1.5" Steel Ball Bearing!
Electrical Discharge Phenomenon Created With Tesla Coils
(At Normal Atmospheric Pressures)
Chapter 1:  Prelude:  Photographs 2004 - 2006
Low power Tesla Coil experiments:

Static Discharges from a Pancake Coil:
Electrostatic Charging of Cardboard tube with Tesla Coil

Movie:  Thomas Burton Kinraide Reproduction:
Extension-Less Point - Limit-less Plane Spark Gap
with 14" Pancake Coil

 
Reproduction Kinraide Spark Gap:
"Extension-less Point - Limitless Plane Gap"
Kinraide Static Electric Tests...
Partial Static Electricity from a Tesla Coil
Kilowatt Kinraide Coil Flames
Kinraide-Jackson Brush Discharges
Kinraide-Jackson Wispy Discharges
Neon Pancake Discharges
Rotary Spark Gap Pancake Coil Discharges
Strong-Ovington Arcs Sparks and Flames
Strong-Ovington Disk Effluves
Strong-Ovington Ladder of Sparks
Strong-Ovington Press Photos
Strong-Ovington High Resolution Photo
New Years Eve - 2007
Fireworks of a different sort.
Griffith Park Tesla Coil and Reproductions:
Just some of the brilliant work of Bill Wysock
Complete Strong-Ovington Demo Apparatus
Prototype Strong-Ovington Apparatus:
Dr. Strong's Condenser Terminal's!
Complete Half Size Tesla Induction Coil:
An interesting look at a classic forgotten
Tesla Coil design.