Page:New York subway ventilation.djvu/39

Rh (4) Is controllable as to results secured to correspond to hourly, daily or seasonal demands.

(5) Is positive since "sectionalized" into multiple units insuring against crippling of system by failure even of several motors at the same time.

(6) Is economical in installation and maintenance costs.

(7) Is efficient in operation since employing only apparatus especially developed for its intended purpose.

(8) Is cheap to operate since all cost rates are at the minimum.

(9) Is an insurance on lives, comfort, health and efficiency of passengers and employees.

(10) Is available for all subways.

(11) Is harmonious in appearance.

(12) Is hygienic since unaffected by street conditions.

(13) Is weatherproof since devoid of street openings.

(14) Is alterable to suit changing conditions.

(15) Is simple to operate.

(16) Is rugged in use.

(17) Is a "safety first" and an "emergency" system being operable instantly from an idle state.

(18) Is divisible to meet all requirements of subway design and operation.

(19) Is a final solution of the public's demands, the City's experiments, and the operator's obligations, throughout the ten years of planning, building and operating the subways of New York City, which, when completed will, it is estimated:

Comprise more than 240 miles of track, and will have

Cost more than $250,000,000 and will

Carry more than 2,000,000,000 passengers per Annum.