The standardization of vestibular examination is still far from being accomplished. Not only are there various schools of thought but almost each individual examiner employs different methods to perform the tests, the caloric one in particular. The usual cause of the numerous errors and one of the greatest hindrances to the proper standardization of the procedures can be found in the fact that the nystagmus, with all its characteristics, is a phenomenon very difficult to observe and analyze. And even the determination of the starting and stopping time of a reactive nystagmus following calorization is not simple.In order to improve the methods of vestibular examination, the first requirement is to obviate, so far as possible, the troublesome and unreliable subjective observation. This need was recognized by the first pioneers of vestibular physiology, and the search for objective registration or graphical representation of nystagmus has been going on since their time. Many different instruments have been constructed and advocated for this purpose and the more recent ones have given excellent results in the hands of research workers in the specialized laboratory.Surveying the efforts made to obtain graphical recordings of nystagmus, one must go back to Hogyes,! the outstanding vestibular physiologist, who solved the problem simply by inserting a light metal rod into the eye, using the other end of this rod as a scriber over a moving paper roll. About the same time Dewar'' was experimenting with electrical methods.