Bubble level

A bubble level comprising:

• a base;
• a vial sealed to the base with a space therebetween, wherein the vial includes
• a substantially flat exterior surface,
• a first arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface, and
• a second arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface and an approximately 90 degree angle to the first side-wall, wherein the side-walls are bowed outwardly with respect to one another;
• a liquid contained between the base and the vial;
• a bubble in the liquid.

A bubble level operable to indicate when a longitudinal axis of the level is substantially horizontal, the level comprising:

• a base with a substantially flat surface with respect to the longitudinal axis;
• a vial sealed to the base and including
• substantially flat exterior surface with graduations and indicia representative of a midpoint of the graduations,
• a first arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface, and
• a second arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface and an approximately 90 degree angle to the first side-wall, wherein the side-walls are bowed outwardly with respect to one another and meet to form an arcuate apex substantially centered with respect to the exterior surface and closest to the exterior surface at a middle of the apex;
• a space having a cross-sectional area between the vial and the base;
• a substantially opaque liquid disposed within the space;
• and
• a bubble of sufficient size so as to form a sphere with a larger circular cross-sectional area than the cross-sectional area of the space and disposed within the space, wherein the bubble allows light to reflect from the side-walls adjacent the bubble so that the graduations may be seen from a side of the vial when light reflects off one of the side-walls adjacent the bubble.

A bubble level vial operable to contain liquid, the vial comprising:

• a substantially flat exterior surface;
• a first arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface;
• and
• a second arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface and an approximately 90 degree angle to the first side-wall, wherein the side-walls are bowed outwardly with respect to one another and meet to form an arcuate apex substantially centered with respect to the exterior surface such that the apex is closest to the exterior surface at a middle of the apex and furthest away from the exterior surface at both ends of the apex.

A bubble level vial operable to contain liquid, the vial comprising:

• a substantially flat exterior surface including graduations;
• a first arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface;
• a second arcuate interior side-wall arranged at an approximately 45 degree angle to the exterior surface and an approximately 90 degree angle to the first side-wall, wherein the side-walls are bowed outwardly with respect to one another;
• and
• wherein a bubble is formed in the liquid which allows light to reflect from the side-walls adjacent the bubble such that the graduations can be seen from a side of the vial when light reflects off one of the side-walls adjacent the bubble.