According to immediate causes, tremors may be divided into three groups:
1. Toxic tremors, including those due to tobacco, alcohol, alkaloids, metals, hyperthyroidism and probably those due to exhaustion.
2. Organic tremors, including tremor due to brain lesions; e. g., general paresis, multiple sclerosis, cerebral hemorrhage and thrombosis, paralysis agitans, senility.
3. Functional tremors, including tremor due to fear, hysteria, neurasthenia and other psychoneuroses (Crenshaw).
A number of graphic studies of tremors have been made.1
One method of graphically recording tremor movements has been by resting the finger, or object held in the fingers, on a tambor connected to a writing pen. In another method the string galvanometer is used. This of course records not the movements of the part, but the muscular contractions causing the tremor.
It occurred to me that a study of tremor movements might be of diagnostic value if a method for their graphic demonstration
BEALL CG. NEW METHOD OF RECORDING MUSCULAR TREMORS. Arch NeurPsych. 1925;14(6):751-757. doi:10.1001/archneurpsyc.1925.02200180022003