in the drawings , fig1 illustrates generally at 10 an amusement game incorporating the invention and which simulates conditions at the conning station of a typical submarine . the game includes a circular base or platform 12 which forms a deck above which a cylindrical pedestal 14 is mounted . a lockable coin slot panel 16 is mounted on the side of the pedestal for feeding coins into a coin box 18 . an electronics module 20 carrying a suitable power supply , printed circuit board and other components of a game control circuit is mounted on the inside of a hatch 22 provided on a side of the pedestal . a vertically elongate hollow cylinder or column 24 which simulates a periscope column is mounted above the pedestal for rotation about a vertical axis . the periscope column is mounted by means which includes a post 26 coaxially attached on circular bulkheads 28 and 30 affixed within the column . an intermediate portion of the post extends through a bearing 32 carried by the upper end of a frame 34 which in turn is carried on a bulkhead 36 mounted across the upper end of the pedestal . the lower end of the post projects through a bearing 38 mounted in a center opening formed in bulkhead 36 . an annular skirt 40 mounted about the lower end of column 24 rotates in close - shaped relationship with an annular shield 42 mounted above the pedestal for preventing unintended entry beneath the column . the upper end of the column is rotatably supported by a post 44 which is attached to circular bulkheads 46 and 48 affixed within the column . the upper end of the post projects through a bearing 50 carried in the center opening of a panel 52 which in turn is mounted above a cupola base 53 and frusto - conical panel 54 which simulates the overhead of the conning tower . the base 53 is carried at one side by a support frame 56 which extends upwardly from tubular railing 58 . the railing is mounted about the greater part of the perimeter of deck 12 to provide a walkway which isolates the player from surrounding spectators so that the player can walk with the column as it is turned . motion sensing means is provided for sensing the relative position of the column with respect to the pedestal and provide a position input signal to the electronics control circuit for purposes to be explained below . the motion sensing means includes an endless chain 60 trained about a sprocket 62 carried at the lower end of post 22 and also trained about a sprocket 64 carried on a shaft 66 mounted for rotation on bulkhead 36 . the position of a wheel 68 carried at the upper end of shaft 66 is electronically sensed by a suitable position sensing pick - up , not shown , which generates the position input signal for the control circuit . the drive train for the motion sensing means also provides a degree of rotational damping to column 24 for simulating the feel of a periscope . preferably the column is mounted for rotation through an arc of less than 360 °, such as 300 °, so that a flexible electronics cable , not shown , can be connected with module 20 and led through the center of post 26 for connection with a video tube 70 which is mounted on brackets 72 above bulkhead 28 . a cupola 74 comprising a cylindrical shell 76 formed of a suitable transparent material , such as clear plastic , is mounted on base 53 above the overhead . the top of the cupola is closed by a cover 78 . within the cupola a backlighted panel 80 shaped as a drum is mounted on a circular disc 82 which is carried on the upper end of post 44 for rotation with the periscope column . the drum is formed of a suitable transparent or translucent material , such as plastic , and it is backlighted by a light source such as the incandescent bulb 84 connected with a power cord , not shown , leading through the center of post 44 down through the periscope column . graphics is applied to the outer surface of panel 80 to form a suitable panoramic scene which is illuminated by bulb 84 and is observed from outside the cupola . the panoramic scene rotates within the cupola as the periscope column is turned so that the scene changes to observers standing around the game . a viewport 86 is mounted on a housing 88 at one side of the periscope column . viewport 80 includes an eyepiece 90 formed of a suitable elastomeric material such as rubber and which is molded to conform to the face of a player so that he is visually isolated from the surrounding room or area in which the game is set up . a pair of handles 92 , 94 extend outwardly from opposite sides of the housing for use in rotating the column . control buttons 96 , 98 are mounted on the handles and are connected with the control circuit for simulating the firing of torpedos in a manner described hereafter . a liquid - containing enclosure 100 is mounted in housing 88 across the eyepiece for forming a simulated image of a water line as seen through a submarine periscope . the enclosure includes a pair of flat walls 102 , 104 formed of a suitable transparent material such as clear plastic and which are mounted in spaced - apart relationship across the line of sight of the viewport by brackets 106 which are bolted within the housing . the enclosure is filled to substantially the horizontal midline of the walls with a suitable viscous liquid 108 such as a silicone liquid having a viscosity on the order of 5 - 10 centistokes ( cs ). the liquid can be colored with a dye for simulating the color of sea water . simulated wave motion as depicted in fig5 is created on the surface of the liquid within the enclosure as the periscope column is rotated by the player . video tube 70 is mounted within the periscope column with the screen 109 facing upwardly . a mirror 110 is mounted at a 45 ° angle within housing 88 above the tube so that the video display is reflected along the line of sight of the viewport superimposed with the water line image . immediately above video tube 70 and below the mirror a horizontal transparent plate 112 is mounted . the plate is formed with a periscope - type graticule 114 having crosshairs and stadia marks , the outline of which is reflected by mirror 110 along the line of sight of the viewport to create the image illustrated in fig4 . the control circuit within module 20 operates tube 70 to form a progression of animated video displays which are generated by suitable integrated circuit semiconductor chips . the video displays simulate a typical surface view as seen through the periscope of a submarine , such as when attacking a target . for example , the video display illustrated in fig6 would represent merchant ships which are presented as targets to the player . the display of fig7 represents a merchant ship toward which are emerging torpedoes fired by the attacking submarine . the display of fig8 represents a ship which is sinking after a hit from a torpedo . fig9 represents destroyers or escort vessels which are attacking the submarine . fig1 illustrates the manner in which the optical system of the invention represents to the view of the player superimposed images of the graticule of fig4 the water line of fig5 and a video image of a ship immediately after being struck by a torpedo . the control system also generates digital information on the video screen , which information is continually updated so that the player can monitor progress of the game . fig5 and 10 illustrate typical digital information which includes the azimuth in degrees of the periscope bearing , the &# 34 ; tons sunk &# 34 ; or cumulative score , and the military time . speakers 116 are mounted on the column above the viewport housing and are connected with the control circuit to generate a program of sounds which simulate the audio environment in a conning tower during a torpedo attack . the control circuit can be programmed to provide a variety of simulated sounds including , for example , the sonar ping from surface vessels , the intercom talk such as torpedo firing commands , the firing and explosion of torpedos , a klaxon horn or dive warning , the steam siren of an attacking destroyer , and the sound of depth charges . the different sounds are programmed to coordinate with the appropriate video displays as the game progresses . the use and operation of the invention is as follows . the game is initiated by inserting a coin in the slot of panel 16 and pressing the start or &# 34 ; up periscope &# 34 ; button 118 . the control circuit is activated to generate a video display on the screen of tube 70 , such as the merchant ships illustrated in fig6 . the speakers are also activated to provide the simulated sound of intermittent sonar pings . while looking through viewport 86 the player rotates periscope column 24 by the handles until the cross hairs of graticule 114 are on a target of opportunity . the fire buttons on either handle are depressed and the control system generates the display of torpedos shown in fig7 . the player can then rotate the column to another target in an attempt to sink it . as the column is rotated the chain 60 drives motion sensing wheel 68 for generating a position input signal which is monitored by the control circuit to operate the video display and depict the periscope view as if undergoing a change in azimuth , i . e . the display sweeps across the simulated surface scene . the display of a hit on a target is shown in fig1 , while the sinking of a ship is shown in fig8 . while the column is rotated the inertia of the liquid causes the liquid level in enclosure 100 to undergo relative motion and simulate surface waves . after a predetermined period of time the control system generates the display of attacking escort destroyers shown in fig9 . the player must find and sink the attacking destroyer in a certain period , otherwise the simulated depth charge attack from the destroyers will terminate the game . while the foregoing embodiments are at present considered to be preferred it is understood that numerous variations and modifications may be made therein by those skilled in the art and it is intended to cover in the appended claims all such variations and modification as fall within the true spirit and scope of the invention .
an amusement game which includes a rotating column and viewport for simulating the periscope column at the conning station of a submarine . a video tube is mounted within the column and is operated to form a video display simulating periscope scenes projected along the line of sight of the viewport . an enclosure with transparent walls which confine a liquid is carried within the column and is disposed across the line of sight for creating a simulated water line which is superimposed together with a graticule on the video display . a speaker is carried on the column for simulating the audio environment at the conning station . a deck and railing are mounted about the column , and the railing supports a simulated overhead above the column . a cupola having a peripheral panel of transparent material is mounted on the overhead , and a backlighted drum displaying a panoramic scene is mounted within the cupola for rotation with the column .