AUTOMATIC 

 OPERATION 

 OF ELEVATOR 

 DOORS 



Each of the elevator openings throughout the 

 building is provided with a pneumatic door opener 

 and closer of a new and unique 

 design, the special feature of which 

 is a differential action, giving the 

 maximum power at the point of 

 opening, also at the point of closing, 

 and minimum use of air. Its slowest speeds are at 

 the points of opening and closing and the maximum 

 speed of opening or closing is at the halfway point. 

 Another feature of the device is that it has a 

 positive lock when open or closed, thus giving abso- 

 lute assurance that the door cannot be opened from 

 the landing without the proper instrument for operat- 

 ing the valve in the hatch. These devices are oper- 

 ated through a cam attached to the top of the elevator, 

 operated by foot treadle in the car. The air which 

 operates this device is furnished by a Clayton Air 

 Compressor, at 30 pounds pressure, located in the en- 

 gine room. The air before reaching the door opened 

 and closed is passed through a mechanical arrange- 

 ment whereby a certain amount of lubricant is car- 

 ried forward, thus insuring the automatic lubrication 

 of the devices at all times. 



An especial feature of this equipment is the 

 pneumatic door opener and closer on the ground and 

 first Mezzanine floors, where the doors themselves are 

 solid bronze, four panels, folding type. These doors 

 are very heavy and the device succeeds in opening 

 from a straight line position and closing to a straight 

 line position. 



In the Chief Engineer's office there are five 8- 

 inch Electrical Time Recorders, made by the Bristol 

 FI FCTPIC TIMF Manufacturing Co., and mounted 

 on a wn ite Italian marble board. 

 These instruments are connected to 

 the five generating sets in the power plant for record- 

 ing their time of operation. 



As a supplementary equipment to the position 

 indicator board in the Chief Engineer's office, there 

 are small lamps operated from the 

 various machine rooms showing the 

 Chief Engineer where the employees 

 are located. Each circuit breaker 

 on the electric elevator control in 

 the various machine rooms are connected with mini- 

 ature lights installed on part of this board so that 

 the Chief Engineer may know which circuit breaker 

 in the group is open. 



This installation was made by the Elevator Repair 

 and Supply Company of New York. 



[51 



CIRCUIT 

 BREAKER AND 

 EMPLOYEES' 

 INDICATOR 



ELEVATOR FRONTS 



The elevator fronts for the 2d to 40th floors in- 

 clusive, and for the shuttle elevator 36th to 39th floors, 

 were furnished and erected by the Hecla Iron Works, 

 manufacturers of architectural bronze and ironwork, 

 North Eleventh and Berry Streets, Brooklyn, N. Y. 

 The doors are twofold, arranged to slide back of 

 a standing leaf, so that when they are closed the 

 front consists of three panels, as shown by the il- 

 lustration. 



Both doors and standing leaves are constructed 

 with wrought iron frames. Each is divided into an 

 upper and a lower panel. The lower panels are filled 

 in with No. 12 B. & S. gauge sheet iron, perfectly flat 

 and smooth, secured into place with moldings. 



The wrought iron grillework is ornamented with 

 cast-brass rosettes, spaced at regular intervals, as 

 shown on the illustration. As all the ironwork is 

 finished in dull black, the contrast between it and the 

 brass rosettes is very effective and pleasing. 



