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Re: 1920's Tesla Coil, Fischer Type H, 12 AMP !!
I have a question: What kinds of 'procudures' were these machines used for?
At 05:30 AM 6/29/99 -0600, Tesla List wrote:
>Original Poster: Jeff Behary <jeff_behary-at-hotmail-dot-com>
>I just received a 75 pound work of art! A 1920s Fischer Diathermy Machine,
>type H. It is more of a cross between a Tesla Coil and a d'Arsonval Coil,
>approx. 12" x 12" x 18".
>Usually d'Arsonval coils are high current Tesla Coil primaries, from which
>various taps are lead to outputs for varying voltages of high current and
>frequency for surgical work. This particular machine has a large knob in
>the front that is attatched to a rack and pinion, which moves a primary coil
>over a secondary coil to adjust coupling (ie, intensity of current). The
>secondary is almost identical to the primary, only one fits inside of the
>This machine had a large transformer, usu. 3000 volts. It has 2 series mica
>condensers, and 5 MASSIVE finned stationary spark gaps with 1/2" tungsten
>discs. This is the "heavy dutiest" of any spark gap I've seen in a
>diathermy machine, even more rugged than the typical Fischer gaps. Very
>Now, the scary thought is that 12 amps of are being drawn from the mains.
>These 12 amps charged the condenser and were passed through the gaps in the
>usual fashion to the primary coil. As the secondary coil is the same amount
>of turns, the current induced in the secondary is EXTREMELY high -- and THIS
>current was conducted DIRECTLY to the patient through metal electrodes. If
>these electrodes were not in DIRECT contact with the skin, an arc would form
>instantly burning a hole in the skin!
>Patients were often petrified, and Fischers large manual has a chapter
>devoted to preparing the patients for such scary treatments, and calming
>those already scared out of their wits!
>Most of Fischers machines DID however have secondary coils made to give
>"high frequency effluve" or hot sparks, as well as the above "d'Arsonval"
>and "Thermo-Penetration" "Low/Medium/High" currents...however taps for these
>later currents were taken DIRECTLY from the primary, meaning a mis-fire of
>the spark gap leaves a patient firmly wired directly to a 3000V 6A
>Not exactly OSHA approved!
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