Learned a new word today

The word is Ballistocardiography <-- this link is to the Wikipedia definition. Here is a paper describing a Ballistocardiograph. An excerpt:

A BCG suspension table for displacement or force recording was designed and built in our Department of Physiological Sciences. A rigid, rectangular, metallic framework taken from an old clinical examination bed was used. Four nylon cords (80-kg load capacity each) were affixed to the upper framework at its four corners by means of four adjustable screws for a final suspension distance of 60 cm. A wood table (200 � 40 � 2 cm) was hung by the four nylon cords and perfectly balanced and leveled in the horizontal plane by the adjustable screws. All four nylon suspension cords were placed strictly perpendicular to the table. To reduce the bulk that will be impelled by the force vectors the wood table must be light enough, ≥10 times less than body weight; in the present case, the table was 3.8 kg. The surface of the BCG table must also be rough enough to ensure that the body impulse generated by the cardiac force vectors will be totally transmitted to the table without the body sliding. The surface of the table can be made rough enough by sandpapering.

Cool idea!