Cardiograph is a universal app that purports to measure your heart rate via the cameras built into the iPhone or iPad 2. The app has a very slick-looking user interface reminiscent of a real-world ...

DR. A. L. GALABIN, whose investigations with the sphygmograph and cardiograph we have had the opportunity of noticing on former occasions (vide NATURE, vol. xii. p. 275), has introduced a ...