PHOTOGRAPHY Two important scientific processes that paved the way for photography. The first was the camera obscura and the second was the use of chemicals such as silver chloride and powdered nitrate from silver. The first picture was produced in June/July 1827 by Niepce, which took eight hours to develop. His partnership with Louis Daguerre established on January 4, 1829 led to Daguerre’s now famous Daguerreotypes. Daguerre shortened the exposure time from eight hours down to half an hour and discovered that images could be made permanent by immersing it into salt. Daguerreomania developed overnight success and great public interest. It wasn’t until William Talbot’s Calotypes that an unlimited amount of positive prints could be made. A major step in photography was Dr. Richard Maddox’s use of gelatin as a bases for photograpic plates, which led to the dry plate process that created the possibility of taking pictures without having specialized knowledge. George Eastman’s invention of the box camera in 1888, allowed photography to reach a greater number of people.Some artists saw photography as a threat to their careers, but would later be viewed as a form of high art,and a tool for mass communication.
First photo Kodak Box Camera 1827 1888
RADIO Radio was a collaborate effort of many inventors and began with Guglielmo Marconi’s invention of his spark transmitter with antenna in 1894. But 30 years before Marconi, Cambridge professor James Maxwell, though never experienced radiowaves, theorized that radio waves could be reflected, absorbed, and focused, having an effect on an object in focus. In 1887, Heinrich Hertz put Maxwell’s theory into practice, and 1894 Oliver Lodge succeeded in transmitting wireless signals over 150 yards. In 1900, the radio saved hundreds of lives when it was used for the first time during a rescue mission for a ship in turmoil. In Canada, Reginald Fessenden invented a continuous voice transmitter in 1905 which led to a voice broadcast in the North Atlantic on Christmas 1906. Harold D. Arnold of AT&Tdeveloped the amplifying vacuum in 1913 that made the first coast to coast telephony and led the first translantic radio transmission in 1915. The effect of radio had a tremendous impact on the world. World War I was the first war that expreienced the widespread use of the radio, mainly the use of the Morse code. With the radio, many people around the world have the privelege of instant communication and connection.
Radio reciever 1900