70 A NEW OPERATING CHAIR. 



and seat is used, the patient is adjusted by tlie aid of 

 moveable cushions, and is requested to sit higher or 

 lower in the chair, as may be required. Mechanical 

 appliances for raising the seat and effecting other 

 movements in the chair, have not hitherto met with 

 very general approval in this country, partly on 

 account of the intricate character of the machinery 

 employed, which was difficult of application, and con- 

 sequently became easily deranged; partly because the 

 exterior of the chair usually exhibited a more formi- 

 dable appearance than the ordinary reclining chair. 

 The prejudice which exists in the mind against 

 making any change in that which has been used suc- 

 cessfully for many years has also had some weight. 



In directing the attention of the meeting to the 

 operating chair exhibited to-night, it is believed 

 that the object desired by the operator, viz., that of 

 being enabled readily to adjust the head of his 

 patient in the best position for operating, has been 

 accomplished. 



The various movements in the chair are effected 

 by the aid of the Archimedean screw and pinion- 

 wheel, and can be used almost insensibly to the 

 patient whilst sitting in the chair. The parts of 

 the chair capable of being moved are, the seat, back, 

 and head-piece. 



The following are their movements : — 



The seat may be moved 



Upwards 



and 

 Downwards. 



