11 outside the vehicle more distant from the operator than the object both the contour and the object being within the operator 39 s field of view a second embodiment of the invention is illustrated in fig3 wherein the support is constituted by an elongate sleeve 30 secured to one end to a suction cup 31 by means of a ball and socket joint 32 that allows the sleeve to be positioned in any number of angular positions relative to the surface to which the suction cup 31 is fixed in this case the side or rear window of the vehicle 10 the support 15 further includes an arm 34 extending within the distal end of the sleeve 30 for telescopic movement relative to the sleeve 30 and a finger 35 pivotally connected by pin 36 to the distal end of the arm 34 a spring 37 within the sleeve 30 bears against an end of the arm 34 and urges it to its fully extended position the same being limited by a tab 34a on arm 34 that projects into slot 30a in sleeve 30 line bearing means comprise a pair of spaced discs 39 mounted at the free end of the finger 35 as shown in fig3 and 4 the finger 35 may extend axially of the arm 34 or it may extend at an angle thereto due to the pivot pin 36 so that the device may be fixed to a rear window 10a or a side window 10b of a station wagon having a rearwardly facing seat for example at any desired position thereof.