The sanitary system is another important feature. The supplying of water for wash-stands, the dispositions of wastes and the flushing of lavatories tax all the skill of the mechanical engineer. Several of these mighty buildings call for upwards of a thousand lavatories.
In considering the sky-scraper we should not forget the role played by the electric elevator. Without it these buildings would be practically useless, as far as the upper stories are concerned. The labor of stair climbing would leave them untenanted. No one would be willing to climb ten, twenty or thirty flights and tackle a day's work after the exertion of doing so. To climb to the fiftieth story in such a manner would be well-nigh impossible or only possible by relays, and after one would arrive at the top he would be so physically exhausted that both mental and manual endeavor would be out of the question. Therefore the elevator is as necessary to the skyscraper as are doors and windows. Indeed were it not for the introduction of the elevator the business sections of our large cities would still consist of the five and six story structures of our father's time instead of the towering edifices which now lift their heads among the clouds.
Regarded less than half a century ago as an unnecessary luxury the elevator to-day is an imperative necessity. Sky-scrapers are equipped with both express and local elevators. The express elevators do not stop until about the tenth floor is reached. They run at a speed of about ten feet per second. There are two types of elevators in general use, one lifting the car by cables from the top, and the other with a hydraulic plunger acting directly upon the bottom of the car. The former are operated either by electric motors or hydraulic cylinders and the latter by hydraulic rams, the cylinders extending the full height of the building into the ground.
America is pre-eminently the land of the sky-scraper, but England and France to a degree are following along the same lines, though nothing as yet has been erected on the other side of the water to equal the towering triumphs of architectural art on this side. In no country in the world is space at such a premium as in New York City, therefore, New York per se may be regarded as the true home of the tall building, although Chicago is not very much behind the Metropolis in this respect.
As figures are more eloquent than words in description the following data of the two giant structures of the Western World may be interesting.
The Singer Building at the corner of Broadway and Liberty Street, New York City, has a total height from the basement floor to the top of the flagstaff of 742 feet; the height from street to roof is 612 feet, 1 inch. There are 41 stories. The weight of the steel in the entire building is 9,200 tons. It has 16 elevators, 5 steam engines, 5 dynamos, 5 boilers and 28 steam pumps. The length of the steam and water piping is 5 miles. The cubical contents of the building comprise 66,950,000 cubic feet, there are 411,000 square feet of floor area or about 9-1/2 acres. The weight of the tower is 18,300 tons. Little danger from a collapse will be apprehended when it is learned that the columns are securely bolted and caissons which have been sunk to rock-bed 80 feet below the curb.
The other campanile which has excited the wonder and admiration of the world is the colossal pile known as the Metropolitan Building. This occupies the entire square or block as we call it from 23rd St. to 24th St. and from Madison to Fourth Avenue. It is 700 feet and 3 inches above the sidewalk and has 50 stories. The main building which has a frontage of 200 feet by 425 feet is ten stories in height. It is built in the early Italian renaissance style the materials being steel and marble. The Campanile is carried up in the same style and is also of marble. It stands on a base measuring 75 by 83 feet and the architectural treatment is chaste, though severe, but eminently agreeable to the stupendous proportions of the structure. The tower is quite different from that of the Singer Building. It has twelve wall and eight interior columns connected at every fourth floor by diagonal braces; these columns carry 1,800 pounds to the linear foot. The wind pressure calculated at the rate of 30 lbs. to the square foot is enormous and is provided for by deep wall girders and knee braces which transfer the strain to the columns and to the foundation. The average cross section of the tower is 75 by 85 feet, the floor space of the entire building is 1,080,000 square feet or about 25 acres.
The tower of this surpassing cloud-piercing structure can be seen for many miles from the surrounding country and from the bay it looks like a giant sentinel in white watching the mighty city at its feet and proclaiming the ceaseless activity and progress of the Western World.