History of air conditioning, invented by Willis Carrier – cool reading for a hot day

Willis Carrier submitted drawings of the first modern air conditioning system on July 17, 1902.

Carrier was working to solve a problem that effected the quality of printing…

He came up with the brilliant idea to circulate cold water rather than steam through heating coils in a machine he used to test heaters.

Carrier’s design was credited as the first to address four basic functions necessary for air conditioning. An air conditioner must: 1. control temperature, 2. control humidity, 3. control air circulation, and 4. cleanse the air.

After the first appearance of Carrier’s air conditioner drawings in 1902, the air conditioner has revolutionized the comfort of people in many different activities.

This timeline from Carrier highlights some of the major impacts of air conditioning on society.

 

1902– First application of modern mechanical air conditioning, Sackett-Wilhelms

printing plant, Brooklyn, N.Y.

1914– First application of air conditioning in a residence – Charles Gates mansion, Minneapolis, Minn.

1924– First department store air conditioned, J.L. Hudson’s, Detroit, Mich.

1925– Movie theaters cooled: Grauman’s Theater, Los Angeles, Calif., Rivoli Theater, N.Y.

1928-29– Chambers of the U.S. House of Representatives and Senate air conditioned

 

See the rest of the timeline and read the full articleThe Journey of Air Conditioning: 1902-Today

 

 

Continue reading History of air conditioning, invented by Willis Carrier – cool reading for a hot day

Why is Dentistry so out of date?

Brushing, flossing, white strips and mouthwash: Thanks for all the help, but your services may no longer be required. The end of the cavity could be upon us.

UCLA microbiologist Dr. Wenyuan Shi has developed a mouthwash that completely eliminates the most malevolent of the 1,000 species of bacteria that can live in your mouth—after just one use. In a clinical study, 12 subjects who rinsed just one time with the mouthwash experienced a nearly complete elimination of the baleful bacteria, Streptococcus mutans. Four days after the first rinse, their mouths remained mutans-free.

Shi’s mouthwash is currently being tested by the FDA . If the mouthwash passes that hurdle, it will be the first cavity fighter approved since fluoride 60 years ago.

“I actually had no dental training,” Shi recalls, laughing. But once he began teaching, he was struck by how, in a country where we can reduce the risk of heart attacks and diabetes, battle cancer and lower cholesterol, dentistry remained out of date. The scientist-scholar resolved to work toward converting dentistry from a surgical model to a medical model.

“Last year in American health spending, heart disease was No. 1, cancer was No. 2 and dentistry was No. 3,” Shi notes. “We spent about $100 billion. In part, because it’s so old-fashioned. Mechanical removal is still the primary tool.”

via UCLA Magazine