c.1900, French, signed 'Boulitte' and to case lid 'Ets G Boulitte, Ingenieurs-Constructeurs 15-21 r. Robillot, Paris 13e', marking chronograph with spring-wound clockwork, pillar clamp, scriber arm and tension controls, twin dials showing seconds and minutes, in velvet lined fitted case; Note: Mechanism can be set to deliver one tick mark every second or every 1/5th second to provide accurate timing on a dum recording of cardiac activity and other quantitive physiological parameters