CH. XI] OPERATING ROOM 397 



557. Construction of a modern operating room. For the 



construction of the operating room itself a good description is given 

 byF. H. Richardson in the Moving Picture World of August 12, 

 1911, p. 372. See also Richardson's Handbook, pp. 65-93. 



(1) "No operating room may have less than 50 square feet of 

 floor surface, or be less than seven feet, in the clear, from floor to 

 ceiling at any point. 



(2) All operating rooms shall have a vent flue of not less than 

 1 3/2 square inches area to each square foot of floor area, same to 

 extend from the ceiling, or a point near the ceiling, to the open air, 

 above the roof if possible ; provided, however, that no vent exceed 

 360 square inches in area. 



(3) All operating rooms shall be of such fireproof construction 

 as is approved by the National Board of Fire Underwriters or the 

 City Fire Marshal. 



(4) Every operating room shall have a door, opening outward, 

 not less than 2x6 feet in size, provided with an appropriate spring 

 to hold same shut. 



(5) Every opening from operating room into auditorium, 

 except door, shall be equipped with a metal shutter, sliding in 

 grooves and semi-automatic in action. Same shall be so arranged 

 that all shutters are held open by a single cotton master cord 

 passing directly over front edge of upper magazine of each machine, 

 just high enough to clear operator's head when standing. Shutters 

 may close by their own weight or by force of a spring. If vent 

 flue is provided with damper it shall be so weighted that it will 

 normally stand open and shall only be held shut by cord attached 

 by master shutter cord before mentioned. 



(6) Front, sides, and top of every lamp-house shall be tightly 

 enclosed, except for vent-holes, protected by wire gauze screen, but 

 back of lamp-house may be open. 



(7) All moving picture projection machines shall be equipped 

 with approved upper and lower magazines, doors of which shall be 

 closed when machine is running. 



(8) All rheostats shall be located outside the operating room, 

 but low voltage transformers (inductors, economizers, etc.), used 

 to control the current may be located inside the room. 



