History of the Pneumatic Tubes

Pneumatic devices are various tools and instruments that generate and utilize compressed air. Pneumatics are everywhere in important inventions, however, they are relatively unknown to the general public. History of the First Pneumatic Tools The hand bellows used by early smelters and blacksmiths for working iron and metals was a simple type of air compressor and the first pneumatic tool. Pneumatic Air Pumps and Compressors During the 17th century, German physicist and engineer Otto von Guericke experimented with and improved air compressors. In 1650, Guericke invented the first air pump. It could produce a partial vacuum and Guericke used it to study the phenomenon of vacuum and the role of air in combustion and respiration. In 1829, the first stage or compound air compressor was patented. A compound air compressor compresses air in successive cylinders. By 1872, compressor efficiency was improved by having the cylinders cooled by water jets, which led to the invention of water-jacketed cylinders. Pneumatic Tubes The best-known pneumatic device is, of course, the pneumatic tube. A pneumatic tube is a method of transporting objects using compressed air. In the past, pneumatic tube s  were often used in large office buildings to transport messages and objects from office to office. The first documented genuine pneumatic tube in the United States is officially listed in a 1940 patent issued to Samuel Clegg and Jacob Selvan. This was a vehicle with wheels, on a track, positioned within a tube. Alfred Beach built a pneumatic train subway in New York City (a giant pneumatic tube) based on his 1865 patent. The subway ran briefly in 1870 for one block west of City Hall. It was Americas first subway. The cash carrier invention sent money in little tubes traveling by air compression from location to location in a department store so that change could be made. The first mechanical carriers used for store service was patented (#165,473) by D. Brown on July 13, 1875. However, it was not until 1882 when an inventor called Martin patented improvements in the system that the invention became widespread. Martins patents were numbered 255,525 issued March 28, 1882, 276,441 issued April 24, 1883, and 284,456 issued on September 4, 1883. The Chicago postal pneumatic tube service began between the post office and the Winslow railroad station on August 24, 1904. The service used miles of tube rented from the Chicago Pneumatic Tube Company. Pneumatic Hammer and Drill Samuel Ingersoll invented the pneumatic drill in 1871. Charles Brady King of Detroit invented the pneumatic hammer (a hammer which is driven by compressed air) in 1890, and patented on January 28, 1894. Charles King exhibited two of his inventions at the 1893 Worlds Columbia Exposition; a pneumatic hammer for riveting and caulking and a steel brake beam for railroad road cars. Modern Pneumatic Devices During the 20th century, compressed air and of compressed-air devices increased. Jet engines use centrifugal and axial-flow compressors. Automatic machinery, labor-saving devices, and automatic control systems all use pneumatics. In the late 1960s, digital-logic pneumatic control components appeared.

My Experience At My High School Year Essay - 959 Words

It is always good to desire. Desire a change, a new beginning, a new option. Sometimes, what we hold is not enough. Sometimes, what we hold is not what we want. Maybe if a complete dark silence replaces what we have abandoned, we will come to appreciate what we had. Although, maybe, if we never live of quiet desperation, we might never acknowledge what we had, have, and will have. I never saw myself as someone who will look backwards, regretting partially the decision that I took. During my High School years, my only desire was to get away from the place I called home. I could not wait to see myself outside the door of my house, doing something that did not relate to my family and well, what I called friends. I never felt comfortable, I had to get away, to be alone, to be in a place where no one would need me, a place where I would only depend on myself. 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Bar Kochba Revolt Essay Example For Students

Bar Kochba Revolt Essay The Jewish revolt led byBar Kochba in 132 AD was not the work of a single if a single radical revolutionary. It was the inevitable result of years of promises not kept to the Jews, andlaws which suppressed the basis of Jews as a nation. To understand the reasonfor Bar Kochbas Revolt one must go back many years even before the war. Priorto Hadrian, an emperor by the name of Trajan was the ruler of the Roman empire. Due to the rebellion of the Jews in the Diaspora to the east and the westof them, Trajan, in order to keep the Jews in Palestine from rebelling he hadto send a great general to be governor of the Jews in Palestine, a generalwho was well with the harshness in which he treated people. This generalsname was Tineius Rufus, he was the general that put down the uprising of theJews in Parthia. Because of Rufus reputation of his severity to the Jews,he uprooted any thought of the Jews in Palestine to rebel against Rome at thattime. The Jews did not want to rebel anyway. Trajan had promised the Jewsthat he would rebuild the asenv ,hc, the Jews assumed this also meant to rebuildJerusalem.The Pagans in Palestine did not want the asenv ,hc to be rebuilt,they thought that if it was rebuilt it would be the rebirth of the Jewish nation. Also, in addition, Trajan, the Emperor who made this promise died and wassucceeded by Hadrian. The Jews were unsure if Hadrian would keep the promisethat Trajan once made. Hadrian wanted to go to Jerusalem to see what he wasrebuilding before he started the construction. When Hadrian got there he wasawed by the sight of a once desolate and fruitful city in ruins. He immediatelywanted to start the reconstruction.However later the Jews were surprisedand disappointed to discover that Hadrian wanted to rebuild Jerusalem not asa city for the Jews to restart in, but as a Pagan city sanctified to the PaganG-d Jupiter. He was going to put an alter where the Jews asenv ,hc once stood. Hadrian was to be the high priest. What once was called Jerusalem would nowbe called Aelia Capitolina. This was a mockery to the Jews. The Jews waitedsixty years from the destruction of the Second asenv ,hc for Rome to restoreit to them. The Jews held themselves back from Rebelling with their neighboringJews in Diaspora because they held onto, and believed that Trajans promisewould be kept. Furthermore, Hadrian later made a prohibition of circumcision. Consequently the Jews saw in Hadrian another Antiochus Epiphanes. And wherethere was an Antiochus, a Maccabee was bound to arise. THE JEWS HAD TO REVOLT. The Romans had by now either banned or mocked some of the most important beliefsin Judaism. If they did not revolt against the Romans they would have died,in a spiritual sense. Even if the Romans didnt kill them, they would notreally be Jewish anymore. Circumcision, which was the physical differencebetween them as Jews and, as well as a basic premise of their Jewish beliefs. Their only choice was to gain their independence. Rabbi Akiva, a great scholarof his day, also once believed in Tarsus promise. He had also been led astray. Therefore, the great Rabbi helped organize thousands of soldiers to fightfor the independence and welfare of the Jewish people. Rabbi Akiva also pickeda man named Shimon Bar Kochba to lead his army. Rabbi Akiva was sure thatBar Kochba would turn out to be A second Judah the Maccabee.Rabbi Akivawas so sure of this that he called Bar Kochba the jhan. His name alone wasa reference to him being the jhan, his name Bar Kochba means Son of a Starfrom the word Kochab which means star. There was also a sentence in the Torahwhich stated, A star has come forth from David. Both times a star is mentioned. .u98960e71be42c5fcd67d8af9a638b3f3 , .u98960e71be42c5fcd67d8af9a638b3f3 .postImageUrl , .u98960e71be42c5fcd67d8af9a638b3f3 .centered-text-area { min-height: 80px; position: relative; } .u98960e71be42c5fcd67d8af9a638b3f3 , .u98960e71be42c5fcd67d8af9a638b3f3:hover , .u98960e71be42c5fcd67d8af9a638b3f3:visited , .u98960e71be42c5fcd67d8af9a638b3f3:active { border:0!important; } .u98960e71be42c5fcd67d8af9a638b3f3 .clearfix:after { content: ""; display: table; clear: both; } .u98960e71be42c5fcd67d8af9a638b3f3 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u98960e71be42c5fcd67d8af9a638b3f3:active , .u98960e71be42c5fcd67d8af9a638b3f3:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u98960e71be42c5fcd67d8af9a638b3f3 .centered-text-area { width: 100%; position: relative ; } .u98960e71be42c5fcd67d8af9a638b3f3 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u98960e71be42c5fcd67d8af9a638b3f3 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u98960e71be42c5fcd67d8af9a638b3f3 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u98960e71be42c5fcd67d8af9a638b3f3:hover .ctaButton { background-color: #34495E!important; } .u98960e71be42c5fcd67d8af9a638b3f3 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u98960e71be42c5fcd67d8af9a638b3f3 .u98960e71be42c5fcd67d8af9a638b3f3-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u98960e71be42c5fcd67d8af9a638b3f3:after { content: ""; display: block; clear: both; } READ: Art Scams EssayThis is a direct referral to him being the jhan. Bar Kochba had to makesure his army was ferocious and unstoppable. To make sure that his army onlyconsisted of the strongest warriors, he said that only men who would bite afinger off his right hand would merit to be in his army, 200,000 people passedthis test. The Rabbis objected to this manner of testing Jews. They saidto Bar Kochba, How long are you going to turn Jews into ohnun hkgc? Thismeans, how long will you turn Jews into Warriors with imperfection (a missingfinger). Nonetheless, Bar Kochba could think of no other way to test the Jews. So the Rabbis suggested that anybody who can uproot a Cedar of Lebanon whileriding past it on a horse would be deserving to enter Bar Kochbas army, 200,000more people passed this test. After recruiting several others Bar Kochba hadan enormous and ferocious army of about 580,000 people. Bar Kochba was soconfident of his army that before each battle he would say to G-d, RibbonoShel Olam! Do not help us do not hinder us! What Bar Kochba basically meantwas, let nature run its course, we do not need your help. With his army,Bar Kochba started his attack. Instead of Having an attack of Bar Kochbasarmy to all of Palestine at once, he captured Palestine a little at a time. He would take over fortress after fortress, city after city. Pretty soonBar Kochba had overthrown all of Palestine for the Jews. The Jews were onceagain independent. In Jerusalem an alter to the Jewish G-d was placed on theplace where the magnificent asenv ,hc once stood. Also the building of awall around Jerusalem had begun. Despite this new joy brought to the Jews,Bar Kochba knew that the Romans were planning a counter attack so he kept traininghis army. In fact Bar Kochba was right. Hadrian had brought a world renownedgeneral all the way from Britain to lead his army against the Jews. The Romanarmy along with aiding pagan armies went to launch their counterattack againstBar Kochba. The Roman army, much like Bar Kochbas army didnt attack themwith one big battle. They reconquered Palestine one town at a time. Theydefeated little bands of rebels independently defending their cities. TheRomans took back the Galil, Yehuda and eventually the Roman army forced BarKochba into a small fort ified city in Jerusalem called Betar. It was saidthat Betar was impenetrable. Every day of the Roman siege around Betar a mannamed Rabbi Elazar Hamodai prayed to G-d that they should live another day. Rabbi Elazar prayed to G-d everyday, Do not sit in judgment today. Oneday a Kussi snuck into the city. He pretended to whisper into Rabbi Elazarsear. When Bar Kochba heard of this, he questioned Rabbi Elazar. Bar Kochbaasked Rabbi Elazar what was said to him by the Kussi on that day. When RabbiElazar replied that nothing was said to him Bar Kochba kicked Rabbi Elazarand he immediately died. On the Ninth of Av, shortly after Rabbi Elazarsdeath Betar fell. The Ninth of Av was a very mournful day for the Jews, itwas the day of the destruction of the first and second asenv ,hc. The fallof Betar was due to a three main events. The first is that the siege of Betarleft the Jews inside the city starving and exhausted.The second is thata spy from Betar told the Romans a secret way to get into the city.The thirdis that perhaps Bar Kochba was not the real protection of the Jews, Rabbi Elazarwas. He was a righteous man and prayed for the welfare of the Jews and ofhimself every single day.On the battlefield about a half a million Jewswere found dead. The rest of the Jews were either sold as slaves, hid in caves,or fled to other countries. Bar Kochba was found dead on the front. Howeverhe was not found to be killed by a Roman, he was found strangled by a hugeserpent. After they saw that Bar Kochba lost the war and died, they realizedthat Bar Kochba was no jhan. They renamed him from Bar Kochba which symbolizedhim being the jhan, Son of a Star to Bar Koziva Son of deceit. Hadrianrealized that the Jews would never see Rome as a mother country. A Countrythat control them. He realized that the Jews would always see the Romans asTyrants. Hadrian finished the construction of the city made by Hadrian forJupiter called Aelia Capitolina where Jerusalem once stood. The Jews exiledfrom Jerusalem were forbidden to go near the city.The Jews thus every yearon the Ninth of Av would bribe their way into the city and Mourn over the citythat was once the center of their religion. Hadrian issu ed a bunch of prohibitionsagainst Judaism. He forbade Circumcision, keeping the Sabbath, and the makingand keeping of a Jewish Calendar. Though not making a calendar may not seamlike such a harsh punishment but it is. Without a Jewish Calendar you cannotfixate the Jewish Holidays which meant you couldnt keep them. He also prohibitedstudying and teaching. So in short, Hadrian prohibited Judaism. The Jewshad to fight, the Jews had to revolt against the Romans. Even though the revoltyielded disastrous results, the Jews had no other alternative. Bar Kochbajust tried to help. He happened to have been a great general with a magnificentarmy. If anyone of lesser talent was to have been general over the Jewisharmy and led the revolt, it probably would have been even worse. Bar Kochbatherefore was good for the Jews he gave hope to the Jews and gave them a tasteof independence and what it feels like to fight for all you believe in. Hewas the inevitable result of years of suppression. The Jews had no choicebut to revolt. Even if Bar Kochba did not exist a revolt would have stilloccurred maybe with a different date and a different leader, but a revolt wasinescapable. Bibliography1. SolomonGrayzel, A History of the Jews (Philadelphia: The Jewish Publication Societyof America, 1961) pages.180-185, 199-201, 204-205, 212, 3802. Rabbi Dr. .u6c0f75c37e7ace518293a777c1010ea9 , .u6c0f75c37e7ace518293a777c1010ea9 .postImageUrl , .u6c0f75c37e7ace518293a777c1010ea9 .centered-text-area { min-height: 80px; position: relative; } .u6c0f75c37e7ace518293a777c1010ea9 , .u6c0f75c37e7ace518293a777c1010ea9:hover , .u6c0f75c37e7ace518293a777c1010ea9:visited , .u6c0f75c37e7ace518293a777c1010ea9:active { border:0!important; } .u6c0f75c37e7ace518293a777c1010ea9 .clearfix:after { content: ""; display: table; clear: both; } .u6c0f75c37e7ace518293a777c1010ea9 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u6c0f75c37e7ace518293a777c1010ea9:active , .u6c0f75c37e7ace518293a777c1010ea9:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u6c0f75c37e7ace518293a777c1010ea9 .centered-text-area { width: 100%; position: relative ; } .u6c0f75c37e7ace518293a777c1010ea9 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u6c0f75c37e7ace518293a777c1010ea9 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u6c0f75c37e7ace518293a777c1010ea9 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u6c0f75c37e7ace518293a777c1010ea9:hover .ctaButton { background-color: #34495E!important; } .u6c0f75c37e7ace518293a777c1010ea9 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u6c0f75c37e7ace518293a777c1010ea9 .u6c0f75c37e7ace518293a777c1010ea9-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u6c0f75c37e7ace518293a777c1010ea9:after { content: ""; display: block; clear: both; } READ: Adolescent Peer Pressure EssayRaphael Posner, eds. Junior Judaica, Encyclopedia Judaica for Youth, (Jerusalem:Keter Publishing House Jerusalem LTD., 1982) s.v. Bar Kokhba pages. 106-1073. Suri Cohen, Mashiach, Mashiach, Mashiach. 1996 (?), School Booklet. ShevachHigh School, New York. pages. 13-184. Naomi Ben-Asher and Hayim Leaf, TheJunior Jewish Encyclopedia (New York City:Sheng Old Publishers Inc, 1967)s.v. Bar Kokhba, Simeon page. 535.Encyclopedia International (Canada:Grolier Inc., 1972) s.v. Bar Cocheba or Bar Kokba page.386Category: History