Integral with the piston bodies are walls 43 which form the walls of the chambers. Preferably, a set of airtight bellows 45, of similar construction to that sold under the designation ME 197-0009-001 by the Belfab Company of Daytona Beach, Fla., are suitably secured between walls 43 and cylinder heads 17A and 17B respectively to form an airtight seal between each piston and its cylinder head. While walls 43 and piston 39 can be made of one magnetisable piece, a preferable and more efficient construction has walls 43 separate from piston 39 and made of a non-magnetisable material. The length of time that a given engine will run is a function of the efficacy of its sealing system. Means, such as bellows 45, for hermetically sealing the cylinders will optimise said length of time. Such a hermetic seal should be secured between walls 43 and cylinder heads 17 to form an airtight seal between them. This seal could be the airtight bellows system shown or some other sealing system such as an oil sealing system.
Cylinder bodies 47 (see Fig.4), made of nonmagnetic material such as stainless steel, extend from the point of attachment of each bellows to its cylinder head to the base of the corresponding pistons, forming sleeves for each piston in which each piston moves. Three sets of electric coils 49A, 49B, 51A, 51B, and 53A, 53B, are wound around sleeves 47, and hence around chambers 41A and 41B, respectively, for generating magnetic fields in the chambers, those coils being generally coaxial with their respective chambers. Each of these coils has an inductance of approximately 100 mH. It is preferred that 14-19 gauge wire be used to wind these coils and that the coils be coated with a suitable coating, such as #9615 hardener from Furane Plastics, Inc., of Los Angeles, California, or the coating sold by the Epoxylite Corp. of South El Monte, California under the trade designation Epoxylite 8683. Each chamber is also surrounded by a pair of capacitors, C1A, C1B and C2A, C2B wound around it, capacitors C1A, C1B having a capacitance of approximately 1.3 microfarads and capacitors C2A, C2B having a capacitance of approximately 2.2 microfarads. The coils and capacitors are potted in hardened epoxy of fibreglass material 55. The epoxy resin and hardener sold under the designations EPI Bond 121 and #9615 hardener by Furane Plastics, supra, are satisfactory, but other epoxy material which will remain stable at temperatures up to 200 degrees F would probably also be acceptable. It is preferred that a small amount of graphite such as that sold under the trade designation Asbury 225 by Asbury Graphite, Inc. of Rodeo, Calif., be included in the epoxy potting to prevent nuclear particles formed in the chamber from escaping from the apparatus. Ten to 15% graphite to epoxy by weight is more than enough.
A typical cylinder is shown in section in Fig.5, showing the piston in its fully extended position with respect to the head and showing many details on a somewhat larger scale than that of Fig.4. A set of seals 57, made of a material such as that sold under the trade designation Teflon by the DuPont Company of Delaware, is positioned between the cylinder head and wall 43 to prevent escape of the working fluid from chamber 41. A filler tube 59 with a ball valve at its lower end is used in filling the chamber with the working fluid but is closed during operation of the engine.
The cylinder head has a generally concave depression therein, indicated at 61, which defines the top end of the chamber. A plurality of electrodes for exciting and igniting the working fluid extend through the cylinder head into the chamber. Two of those electrodes, shown in section in Fig.5 and labelled 63 and 65, have tungsten points 75, while the other two, labelled 67 and 69 (see Fig.6 for electrode 69) are containers called, respectively, the anode and the cathode. The electrodes are generally equidistantly spaced from the axes of their chambers and are generally coplanar to each other, their mutual plane being perpendicular to the axes of their chambers. Each electrode is positioned 90 degrees from adjacent electrodes in this embodiment
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