Comb

Abstract

The invention provides a comb ( 10 ) which includes means for indicating to a holder of the comb when the comb is being held at a predetermined angle to a known datum plane. In a preferred form of the invention, the comb ( 10 ) includes, either fixed to it or integral with it, a scale marked ( 16 ) with angular graduations ( 24 ), and a pointer ( 31 ) which is biased so as to point in a specific direction at all times, alignment of the pointer with chosen graduation on the scale then ensuring that the comb is oriented at a desired angle to the datum plane. The pointer ( 31 ) may, for instance be biased gravitationally so as to point vertically irrespective of the inclination of the comb.

1 . A comb including means for indicating to a holder of the comb when the comb is being held at a predetermined angle to a known datum plane.  
   
   
       2 . A comb according to  claim 1  wherein the means for indicating includes a scale marked with angular graduations, and a pointer which is biased so as to point in a specific direction at all times, thereby forming the datum plane, alignment of the pointer with a chosen graduation on the scale then ensuring that the comb is oriented at a desired angle to the datum plane.  
   
   
       3 . A comb according to  claim 2  wherein the scale is fixed to the comb.  
   
   
       4 . A comb according to  claim 2  wherein the scale is integral with the comb.  
   
   
       5 . A comb according to any one of  claims 2  to  4  wherein the pointer is biased gravitationally to point vertically irrespective of the inclination of the comb.  
   
   
       6 . A comb according to  claim 5  including an angular scale adapted to give its holder an indication of the angular orientation of the comb in a horizontal plane relative to the datum plane.  
   
   
       7 . A comb according to any one of  claims 2  to  4  wherein the pointer is magnetically biased so as to point to magnetic north at all times.  
   
   
       8 . A comb according to any one of the preceding claims including a linear scale.