in fig1 we show one preferred embodiment comprising a non conductive split opaque fiberglass shell 9 mounted on an intermediate voltage electrical wire or cable 11 . a transparent lexan ™ cover 7 covers the reflective chamber 6 containing a neon tube 2 . normally this opaque shell is colored aviation orange for daytime visibility . in one preferred embodiment , the shell is about 20 inches in diameter and 30 inches in length . the shape may be modified , but the shape should allow a sufficient area for the internal capacitor and enough physical diameter to be used as a daytime obstruction device . the shape should be aerodynamic to minimize wind loading . shell 9 may be formed in fiberglass from a polyester resin and covered with a sealing gel - coat for weather ability . several plastics or polymers may be used in the construction of the shell , but must have color retention and durability . typically , shell thickness is about 1 / 8 &# 34 ;. light weight is desirable to minimize wear and loading on cable 11 . the halves of the shell may be conveniently made with a lip or flange 47 and may be snapped or bolted together to reduce element intrusion . drain holes 16 are provided to drain moisture from the shell by gravity flow . if the shell is turned so that the light is used for ground traffic only , then the drain holes and ballasts are located in the proximity of the lamp . conductive coating 5 may be a 5 mil thick metallic paint sprayed to form a capacitor on the shell &# 39 ; s interior . conductive screens , polymers , or resins could also be used . conductive lead 19 is used to electrically connect the conductive coating in the two halves of the shell . dual inductive coils 17 may be glued in place to provide ballast as well as to provide a staggered phasing to increase conspicuity of neon lamp 2 . the neon tube 2 is 54 inches long , 5 mm in diameter and is filled with neon gas under about 19 mm of pressure . the 54 inch tube may be bent to give two or more parallel strands of tubing in the reflective chamber . the tube is fitted with an electrode in each end . we have found by experimentation that with this configuration and gas pressure that the neon lamp 2 will be brightly illuminated when mounted on a 7900 volt ( phase to ground ) line . at the same time the neon lamp 2 should perform equally well without generating undo heat on a 40 , 000 volt ( phase to ground ) line . lower temperature operation is desirable and should give a lamp life measured in years . tube replacement can be quite expensive as some installations are made by using a helicopter . neon lamp 2 is electrically connected at one end to the mounting wire 11 through lead 13 and the other end to dual inductive coils 17 through lead wire 15 . inductive coils 18 each weigh about one pound and have approximately 300 turns of no . 26 gauge copper wire and are themselves connected in series and then electrically connected to the conductive coating 5 . neon lamp 2 is mounted with non - conductive holders 10 in unit 6 which is conveniently made of plastic . the sides , ends and bottom of the trough shaped unit 6 are preferably vacuum plated with reflective aluminum 18 and are electrically connected to lead 15 for anti - corona and safety discharge . transparent lexan ™ lens 7 is contoured for diffuser prismatic 3m solf ™ film 3 to direct light to increase side visibility . in fig2 we show an embodiment of shell 9 , which is elliptically or sausage shaped with unit 6 mounted at right angles to give the necessary 2000 &# 39 ; conspicuity , even if the shell 9 orientation is altered somewhat by wind moving the unit . stabilizer ballast 20 will tend to correct wind movement of the shell 9 by weighting the lowest area of shell 9 . clamps or hangers 14 fasten the shell to the wire or cable 11 and also act as an insulator against electrical shorting . flange 47 may be used to clip or bolt the two halves of shell 9 together . in fig3 we have shown a top view of fig1 . the transparent cover 7 can be more fully observed with the prismatic lens 3 . the flange 47 encircles the shell 9 for attachment of the two halves to reduce element intrusion . in fig4 we have shown a frontal view of a second embodiment of the unit wherein chamber 30 holding the neon tube would be in the shape of a cross as viewed from the top . area 31 is an inner reflective area to increase light output in area 32 . areas 32 are lined with prismatic diffusing solf ™ film to redirect the output of the light emissions from the chamber 30 . the lens 32 has a raised area to increase the vertical beam spread greater than 180 degrees to lateral areas . with the light output from the chamber 30 and with the remainder of the unit is as previously described under fig1 the unit achieves the necessary 2000 &# 39 ; conspicuity . in fig5 we have shown an embodiment where an opaque shell 40 is connected by a flexible cable 14 to lamp mounting unit 42 . clamps 39 mount the unit on and insulate from wire or cable 11 . shell 40 is internally coated with a conductive material 41 , such as a conductive paint , metal , etc ., to form a capacitor when connected to a high voltage source . wire 38 electrically connects conductive material with induction coils 16 which are connected in series . wire 43 electrically connects dual coils 16 to a one electrode of the neon filled tube 45 . for intermediate voltage power lines , we have found that this tube has sufficient illumination when the tube is about 5 mm in diameter at 54 &# 34 ; in length and is filled with 19 mm of gas pressure . the other electrode of the neon tube 45 is electrically connected through wire 50 to cable 11 . the transparent cover 51 is made from lexan ™ and utilizes the prismatic film areas 48 to diffuse light for greater side visibility . reflector 52 aids in the diffusion of the light . shell 40 may be held together by bolted or clipped flange 47 . in fig6 we have shown a cross sectional view of the lamp fig4 to indicate light enhancements by reflectors 52 mounted inside the transparent enclosure 51 such as lexan ™, and diffusing prismatic film 48 mounted in the transparent enclosure 51 surrounding the neon tubes 45 . mounting unit 42 is attached on line 11 with clamps 39 as previously shown . mounting unit is electrically insulated from cable 11 , except for wire 50 , to eliminate surface conduction . the flexible cable 44 is attached to mounting unit 42 and has enough clearance not to interfere with line 11 due to wind movement of the shell 40 .