948 SEC. 18. BIOLOGY. 



3768. Gas Sphygmoscope, by Sigismund Mayer. 



Physiological Institution, Prague. 



The apparatus consists of a small drum or capsule placed on the skin above 

 a beating artery, through which common coal gas is allowed to flow towards 

 a burner. Each pulsation causes a contraction of the flame, and shows, among 

 other things, very plainly the dicrotism of the pulse. 



3769. Apparatus for the Registration of the Respi- 

 ratory Movements. Physiological Institution, Prague. 



The above consists of an air-tight case containing a living animal, which 

 breathes through a tube fastened in the trachea. This tube communicates 

 with the atmosphere through the side of the chest. The air enclosed in the 

 chest is moved in oscillations of pressure by the breathing of the animal, and 

 these oscillations are registered on the kymographion. 



The apparatus allows at the same time the registration of the pressure of 

 the blood, the section of the nervi vagi, the irritation of any desired nerves, 

 and the injection into the jugular vein, without opening the case. 



30 7O. Apparatus for Registering the Respiratory 



Movements. Physiological Institution, Prague. 



In this apparatus the animal inhales from a large air-tight closed receiver, 

 which communicates with the trachea by a tube. The changes in the pressure 

 of the air in the receiver, thus produced, are shown on the kymographion. 

 The air in the receiver is frequently renewed. 



3771. Apparatus for the Demonstration of the mechanical 

 influence of the Action of Breathing on the circulation of the 

 blood. Physiological Institution, Prague. 



3772. Sphygmometer by Dr. Handfield Jones. T.Hawksley. 



3773. Sphygmometer by Dr. Sibson. T. Hawlisley. 



3773a. Original Double Stethoscope, invented by Arthur 

 Leared, M.D. Dr. Bur don Sanderson, F.R.S* 



3773b. Double Stethometer, invented by Arthur Leared, 

 M.D. Dr. Bur don Sanderson, F.R.S. 



3774. Stethometer by Dr. A. Ransome. T. Hau-keshy. 



3775. Dr. A. Ransome's Stethograph for delineating the 

 movements of the ribs during respiration. T. Hawkslcy. 



3776. Dr. Burdon Sanderson's Kymograph, arranged 

 for taking continuous ink tracing of the movements of the 

 arteries. T. Hawksley. 



3777. Dr. Burdon Sanderson's Kymograph with smoked 

 cylinder for spiral traces. T. Hawlisley. 



3778. Dr. Oliver's Kymograph, with Sanderson's Cardio 

 graph and Marey's Tambour, arranged for spiral traces, for uee a 

 the bed side. T. HawksJey 



