Device built by Angelo Mosso to record respiratory and cardiovascular responses to fear. It consisted of a fulcrum base onto which was placed a platform for his subject to lie upon. Using counterweights to bring the platform into balance, the device recorded on a smoked drum using a kymographion the changing balance of the platform that accompanied the undulations of breathing and the shifting concentration of blood in the body. The image below is taken from Mosso’s book Fear (1896).