Wednesday, May 16, 2012

photographic film was pioneered by George Eastman



the "Kodak," trademark, and first camera also patent.
The use of photographic film was pioneered by George Eastman, who started manufacturing paper film in 1885 before switching to celluloid in 1889. His first camera, which he called the "Kodak," was first offered for sale in 1888.


 It was a very simple box camera with a fixed-focus lens and single shutter speed, which along with its relatively low price appealed to the average consumer. The Kodak came pre-loaded with enough film for 100 exposures and needed to be sent back to the factory for processing and reloading when the roll was finished. By the end of the 19th century Eastman had expanded his lineup to several models including both box and folding cameras.
In 1900, Eastman took mass-market photography one step further with the Brownie, a simple and very inexpensive box camera that introduced the concept of the snapshot. The Brownie was extremely popular and various models remained on sale until the 1960s.
Film also allowed the movie camera to develop from an expensive toy to a practical commercial tool.





Despite the advances in low-cost photography made possible by Eastman, plate cameras still offered higher-quality prints and remained popular well into the 20th century. To compete with rollfilm cameras, which offered a larger number of exposures per loading, many inexpensive plate cameras from this era were equipped with magazines to hold several plates at once. Special backs for plate cameras allowing them to use film packs or rollfilm were also available, as were backs that enabled rollfilm cameras to use plates.
Except for a few special types such as Schmidt cameras, most professional astrographs continued to use plates until the end of the century when electronic photography replaced them.

Tuesday, May 8, 2012

Patent, penemuan ban radial

Ban radial, patent penemuan Ban radial adalah sejenis desain ban otomotif. Rancangan ban radial pertama dipatenkan pada tahun 1915 oleh Arthur W. Savage, seorang produsen ban yang sukses dan seorang penemu di San Diego,
 California. Paten Savage telah kadaluarsa pada tahun 1949. Ban radial biasanya digunakan untuk mobil berpenumpang dan truk ringan dan jarang digunakan untuk kendaraan berat seperti tronton atau kendaraan berat lainnya. Ban radial memiliki konstruksi carcass cord membentuk sudut 90 derajat terhadap keliling lingkaran ban. Jadi dilihat dari samping konstruksi cord adalah dalam arah radial terhadap pusat atau crown dari ban. 




Bagian dari ban berhubungan langsung dengan permukaan jalan diperkuat oleh semacam sabuk pengikat yang dinamakan "Breaker" atau "Belt". Ban Radial memiliki jalinan plycord yang membentang dari satu bibir ban ke bibir ban sampingnya. Jalinan antara Plycord juga di perkuat oleh sabuk kawat logam. Desain ini selanjutnya dikembangkan dan dikomersialkan secara luas oleh Michelin pada tahun 1946