Abstract: A concealable firearm in the form of a belt buckle with one or more gun barrels and decorative cover plate. Firing pins are cocked from behind the block of steel forming the gun and a slidable trigger plate locks the firing pins in the cocked position and, after a safety pin is removed, releases the spring biased firing pins upon the pull of a lanyard.

Abstract: An apparatus and method for testing the glucose level in a blood sample is provided. The method includes the step of initially filtering a sample of blood to be tested. A beam of light is provided and split into a pair of beams by a beam splitter. The pair of beams travel along generally parallel paths. One path contains a cell of a known optical pathlength and additionally a compensator. The other path has a cell containing the filtered blood sample to be tested. The pair of beams are then recombined by a mirror and a fringe pattern is detected at a detector. From the fringe pattern, the refractive index of the blood sample can be calculated. The refractive index is easily converted to a specific glucose concentration. Alternatively, the original fringe pattern can be restored by changing the effect of the compensator. The refractive index can then be found from the required compensation.