Evolution of Water Lifting Devices (Pumps) Over the Centuries Worldwide
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1 the History of Vacuum Science and Vacuum Technology
1 1 The History of Vacuum Science and Vacuum Technology The Greek philosopher Democritus (circa 460 to 375 B.C.), Fig. 1.1, assumed that the world would be made up of many small and undividable particles that he called atoms (atomos, Greek: undividable). In between the atoms, Democritus presumed empty space (a kind of micro-vacuum) through which the atoms moved according to the general laws of mechanics. Variations in shape, orientation, and arrangement of the atoms would cause variations of macroscopic objects. Acknowledging this philosophy, Democritus,together with his teacher Leucippus, may be considered as the inventors of the concept of vacuum. For them, the empty space was the precondition for the variety of our world, since it allowed the atoms to move about and arrange themselves freely. Our modern view of physics corresponds very closely to this idea of Democritus. However, his philosophy did not dominate the way of thinking until the 16th century. It was Aristotle’s (384 to 322 B.C.) philosophy, which prevailed throughout theMiddleAgesanduntilthebeginning of modern times. In his book Physica [1], around 330 B.C., Aristotle denied the existence of an empty space. Where there is nothing, space could not be defined. For this reason no vacuum (Latin: empty space, emptiness) could exist in nature. According to his philosophy, nature consisted of water, earth, air, and fire. The lightest of these four elements, fire, is directed upwards, the heaviest, earth, downwards. Additionally, nature would forbid vacuum since neither up nor down could be defined within it. Around 1300, the medieval scholastics began to speak of a horror vacui, meaning nature’s fear of vacuum. -
Rice, Technology, and History: the Case of China
RICE, TECHNOLOGY, AND HISTORY The Case of China By Francesca Bray Wet-rice farming systems have a logic of technical and economic evolution that is distinctively different from the more familiar Western pattern of agricultural development. The well-documented history of rice farming in China provides an opportunity for students to reassess some commonly held ideas about tech- nical efficiency and sustainable growth. rom 1000 to 1800 CE China was the world’s most populous state and its most powerful and productive economy. Rice farming was the mainstay of this empire. Rice could be grown successfully in only about half of the territory, in the south- F ern provinces where rainfall was abundant. There it was the staple food for all social classes, landlords and peasants, officials and artisans alike. The more arid climate in the north was not suited to rice; northern farmers grew dry-land grains like wheat, millet, and sorghum for local consumption. But the yields of these grains were relatively low, whereas southern rice farming produced sufficient surpluses to sustain government and commerce throughout China. Vast quantities of rice were brought north to provision the capital city— home to the political elite, the imperial court, and all the state ministries—and to feed the huge armies stationed along the northern frontier. People said that the north was like a lazy brother living off the generosity of his hard-working and productive southern sibling. Thou- sands of official barges carried rice from Jiangnan to the capital region along the Grand Canal, and more rice still was transported north in private ships along the coast (fig. -
Generate Your Own Hydropower
Generate Your Own Hydropower Objectives The student will do the following: 1 Build a water wheel. 2 Build a simple galvanometer. 3. Build a simple hydropower generator 4. Detect the electricity generated 5 Demonstrate how water power is converted to electricity. Subjects: Advanced General Science, Physical Science, Physics Time: 1-2 class periods if working in groups of four; 2-3 class periods if working in groups of two Materials: (for each group) compass, 2 alligator clips (optional), small spool magnetic wire (#28 or finer, insulated), 2 cardboard or masonite rectangles (about 5” x7”), glue, (2) 1-inch nails, (2) 3-inch nails, 1-inch bar magnet, (2) 1- 1/2”x4” metal strips cut from tin can, electrical tape, germanium diode (for example, type1N34A), soldering iron (optional), solder (optional), 3x5” wood block, round tinker toy. (8) 3” tinker toy spokes, 8 small paper cups, student sheets (included) Background Information The model hydropower generator made in this activity works much like hydropower plants for generating electricity. When the propeller (water wheel or turbine) spins, the magnet whizzing past the nail head generates a tiny amount of alternating current (AC) in the coil wound around the nail. The small germanium diode connected across the two nail terminals converts the AC into DC (direct current). The galvanometer will indicate that a small current has been produced by the generator. Procedure I The day before the activity is to be done, introduce it to the class A Define and describe a turbine A turbine is a device that has a central drive shaft fitted with curved vanes or blades that cause it to whirl when force is exerted upon it by water, steam, or gas. -
Using Pulleys with Electric Motors
USING PULLEYS WITH ELECTRIC MOTORS There are many types of electric motor from small battery powered mirror ball motors turning very slowly to large 240v motors able to rotate at speeds in excess of 1400 revolutions per minute (rpm). Whatever motor you have decided to use for your purposes, you will need to transfer the drive from the motor to your mechanism. In the first of this series of blog posts I am going to focus on pulleys and how they are fitted to electric motors and used in the Theatre and Screen metalwork shop. Later I will add information about using cogs, sprockets and gears. Vee or ‘Wedge’ Pulleys Pulleys are commonly used if the motor is going to rotate at high speed, but not always as I have seen them used in heavy duty mirror ball motors. The drive is transferred to another pulley using a vee belt (both pulley and vee belt are shown in the image above). This type of pulley (with multiple grooves) is called a ‘step pulley’. Step pulleys are used to adjust the speed of rotation of the final drive without having to take the pulley off and replace it with another. The vee belt is ‘jumped’ across the different diameter 'vee groove’ to change the final drive rpm. A large diameter, driving a small diameter will increase the speed of the final drive rpm. Inversely, a small diameter driving a large diameter will reduce the final drive rpm. These are basic gearing principles that are explained. If you are using step pulleys to adjust the drive speed, you will need to ensure that they are both identical in size (matched) or the belt will either; not grip, or be too tight, as you change the belt from groove to groove. -
Engineering Info
Engineering Info To Find Given Formula 1. Basic Geometry Circumference of a circle Diameter Circumference = 3.1416 x diameter Diameter of a circle Circumference Diameter = Circumference / 3.1416 2. Motion Ratio High Speed & Low Speed Ratio = RPM High RPM Low RPM Feet per Minute of Belt RPM = FPM and Pulley Diameter .262 x diameter in inches Belt Speed Feet per Minute RPM & Pulley Diameter FPM = .262 x RPM x diameter in inches Ratio Teeth of Pinion & Teeth of Gear Ratio = Teeth of Gear Teeth of Pinion Ratio Two Sprockets or Pulley Diameters Ratio = Diameter Driven Diameter Driver 3. Force - Work - Torque Force (F) Torque & Diameter F = Torque x 2 Diameter Torque (T) Force & Diameter T = ( F x Diameter) / 2 Diameter (Dia.) Torque & Force Diameter = (2 x T) / F Work Force & Distance Work = Force x Distance Chain Pull Torque & Diameter Pull = (T x 2) / Diameter 4. Power Chain Pull Horsepower & Speed (FPM) Pull = (33,000 x HP)/ Speed Horsepower Force & Speed (FPM) HP = (Force x Speed) / 33,000 Horsepower RPM & Torque (#in.) HP = (Torque x RPM) / 63025 Horsepower RPM & Torque (#ft.) HP = (Torque x RPM) / 5250 Torque HP & RPM T #in. = (63025 x HP) / RPM Torque HP & RPM T #ft. = (5250 x HP) / RPM 5. Inertia Accelerating Torque (#ft.) WK2, RMP, Time T = WK2 x RPM 308 x Time Accelerating Time (Sec.) Torque, WK2, RPM t = WK2 x RPM 308 x Torque WK2 at motor WK2 at Load, Ratio WK2 Motor = WK2 Ratio2 6. Gearing Gearset Centers Pd Gear & Pd Pinion Centers = ( PdG + PdP ) / 2 Pitch Diameter No. of Teeth & Diametral Pitch Pd = Teeth / DP Pitch Diameter No. -
Ancient Egyptian Irrigation
A Drop in the Bucket – Ancient Egyptian Irrigation Author Mimi Milliken Grade Level 6 Duration 3 class periods National Standards AZ Standards Arizona Social Science Standards GEOGRAPHY ELA GEOGRAPHY Element 5: Environment Reading Human-environment and Society Integration of Knowledge and interactions are essential 14. How human actions Ideas aspects oF human liFe in all modify the physical 6.RI.7 Integrate information societies. environment presented in different media or 6.G2.1 Compare diverse ways 15. How physical systems formats (e.g., visually, people or groups of people have affect human systems quantitatively) as well as in impacted, modified, or adapted to 16. The changes that words to develop a coherent the environment of the Eastern occur in the meaning, use, understanding of a topic or Hemisphere. distribution, and issue. Examining human population importance of resources Writing and movement helps Production and Distribution of individuals understand past, NEXT GENERATION OF Writing present, and Future conditions SCIENCE STANDARDS 6.W.4 Produce clear and on Earth’s surFace. NEXT GENERATION coherent writing in which the 6.G3.1 Analyze how cultural and OF SCIENCE development, organization, and environmental characteristics STANDARDS style are appropriate to task, affect the distribution and MS-ETS1-2. Evaluate purpose, and audience. movement of people, goods, and competing design ideas. solutions using a SCIENCE 6.G3.2 Analyze the influence of systematic process to LiFe Science location, use of natural resources, determine how well they 6.L2U1.14 Construct a model catastrophic environmental meet the criteria and that shows the cycling of matter events, and technological constraints of the problem. -
The Impact of Lester Pelton's Water Wheel on the Development Of
VOLUME XXXVIII, NUMBER 3 SUMMER/FALL 2010 A Publication of the Sierra County Historical Society The Impact of Lester Pelton’s Water Wheel On the Development of California Rivals the 49ers! hile hordes of gold-seeking 49ers At the time, steam engines were being W swarmed into the Sierras in search used to provide power to operate the mines of their fortunes, Lester Pelton, a farmer’s but they were expensive to purchase, not son living in Ohio, came to California in easily transported, and consumed enormous W1850 with ambitions amounts of wood resulting that didn’t include gold in forested hillsides mining. He tried making becoming barren in a very money as a fisherman short time. Water wheels in Sacramento before were being tried by some coming to Camptonville mine owners making use after hearing of the gold of the enormous power strike on the north fork available from water in of the Yuba River. Still the mountain regions but not interested in being they were patterned after a miner, Pelton instead water wheels used to power spent his time observing grain mills in the East and the mining operations in Midwest and were not the Camptonville area capable of producing the and noted that both kinds amount of power needed to of mining, placer and operate hoisting equipment hard rock, required large Lester Pelton, whose invention paved the or stamp mills. amounts of power. He way for low-cost hydro-electric power Having never developed realized that hard rock an interest in mining, mining was more difficult to provide because Pelton spent many years doing carpentry power was needed to operate the hoists to and millwrighting, building many homes, a lower men into the mine shafts, bring up schoolhouse, and stamp mills driven by water loaded ore cars, and return the men to the wheels. -
Engine Crankshaft Pulley Clutch
Europaisches Patentamt European Patent Office 0 Publ ication number: 0 136 384 Office europeen des brevets A1 © EUROPEAN PATENT APPLICATION © Application number: 83401933.3 © lnt.CI.«: F 02 N 17/08 F 02 B 67/06 © Date of filing: 03.10.83 © Date of publication of application: ©Applicant: Canadian Fram Limited 10.04.85 Bulletin 85/15 540 Park Avenue East P.O. Box 2014 Chatham Ontario N7M 5M7(CA) @ Designated Contracting States: DE FR GB IT © Inventor: Dejong, Allen W. 34 English Sideroad Chatham Ontario N7M 4417(CA) © Representative: Brulle, Jean et al. Service Brevets Bendix 44, rue Francois 1er F-75008Paris(FR) © Engine crankshaft pulley clutch. © A vehicle engine (10) carries a number of belt-driven accessories which are driven through a belt (16) and a clutch and pulley assembly (14) carried on the engine crankshaft (12). The assembly (14) includes an electromagnetic coil (56) which responds to an electrical signal to couple the pulley (36) for rotation with the crankshaft (12) when a signal is transmitted to the coil (56) and to otherwise permit the crankshaft (12) to turn relative to the pulley (36). A throttle position switch (82) intercepts the signal to the coil (56) when the throttle mechanism of the vehicle is moved to a predetermined position when the vehicle is accelerated to thereby disconnect the pulley (36) from the crankshaft (12) during vehicle accelerations. The coil (56) is also wired through the vehicle ignition switch (86) so that the pulley (36) is also disconnected from the crankshaft (12) when the vehicle is started. 00 M CD M LU Croydon Printing Company Ltd. -
Transfer of Islamic Science to the West
Transfer of Islamic Science to the West IMPORTANT NOTICE: Author: Prof. Dr. Ahmed Y. Al-Hassan Chief Editor: Prof. Dr. Mohamed El-Gomati All rights, including copyright, in the content of this document are owned or controlled for these purposes by FSTC Limited. In Production: Savas Konur accessing these web pages, you agree that you may only download the content for your own personal non-commercial use. You are not permitted to copy, broadcast, download, store (in any medium), transmit, show or play in public, adapt or Release Date: December 2006 change in any way the content of this document for any other purpose whatsoever without the prior written permission of FSTC Publication ID: 625 Limited. Material may not be copied, reproduced, republished, Copyright: © FSTC Limited, 2006 downloaded, posted, broadcast or transmitted in any way except for your own personal non-commercial home use. Any other use requires the prior written permission of FSTC Limited. You agree not to adapt, alter or create a derivative work from any of the material contained in this document or use it for any other purpose other than for your personal non-commercial use. FSTC Limited has taken all reasonable care to ensure that pages published in this document and on the MuslimHeritage.com Web Site were accurate at the time of publication or last modification. Web sites are by nature experimental or constantly changing. Hence information published may be for test purposes only, may be out of date, or may be the personal opinion of the author. Readers should always verify information with the appropriate references before relying on it. -
High Performance Vacuum Pump Bombas De Vacío De Alto
High Performance Vacuum Pump Model 15401/15601/15605 Operating Manual ......................................... 2 Bombas de Vacío de Alto Rendimiento Modelo 15401/15601 Manuel del Operador .................................... 8 Pompe à Vide à Haut Rendement Modèle 15401/15601 Manuel d’utilisation ..................................... 16 Hochleistungs-Vakuumpumpe Modelle 15401/15601 Bedienungsanleitung .................................. 24 Table of contents Robinair® high performance Robinair® high performance vacuum pumps vacuum pumps .....................................................2 Congratulations on purchasing one of Robinair’s Pump components................................................3 top quality vacuum pumps. Your pump has been Warnings .............................................................3 engineered specifically for air conditioning and Before using your vacuum pump ..........................4 refrigeration service, and is built with Robinair’s proven offset rotary vane for fast, thorough To use the gas ballast feature...............................5 evacuation. To shut down your pump after use .......................5 You’ll appreciate these key features . To maintain your high vacuum pump ....................5 Iso-ValveTM Vacuum pump oil .............................................5 Allows the pump to be shut off while still connected to Oil change procedure ......................................5 the A/C-R system, which is handy for checking rate Cleaning your pump.........................................5 -
Introduction to the Principles of Vacuum Physics
1 INTRODUCTION TO THE PRINCIPLES OF VACUUM PHYSICS Niels Marquardt Institute for Accelerator Physics and Synchrotron Radiation, University of Dortmund, 44221 Dortmund, Germany Abstract Vacuum physics is the necessary condition for scientific research and modern high technology. In this introduction to the physics and technology of vacuum the basic concepts of a gas composed of atoms and molecules are presented. These gas particles are contained in a partially empty volume forming the vacuum. The fundamentals of vacuum, molecular density, pressure, velocity distribution, mean free path, particle velocity, conductivity, temperature and gas flow are discussed. 1. INTRODUCTION — DEFINITION, HISTORY AND APPLICATIONS OF VACUUM The word "vacuum" comes from the Latin "vacua", which means "empty". However, there does not exist a totally empty space in nature, there is no "ideal vacuum". Vacuum is only a partially empty space, where some of the air and other gases have been removed from a gas containing volume ("gas" comes from the Greek word "chaos" = infinite, empty space). In other words, vacuum means any volume containing less gas particles, atoms and molecules (a lower particle density and gas pressure), than there are in the surrounding outside atmosphere. Accordingly, vacuum is the gaseous environment at pressures below atmosphere. Since the times of the famous Greek philosophers, Demokritos (460-370 B.C.) and his teacher Leukippos (5th century B.C.), one is discussing the concept of vacuum and is speculating whether there might exist an absolutely empty space, in contrast to the matter of countless numbers of indivisible atoms forming the universe. It was Aristotle (384-322 B.C.), who claimed that nature is afraid of total emptiness and that there is an insurmountable "horror vacui". -
The Mechanical Advantage (MA) of the Lever Is Defined As: Effort Arm / Load Arm = D2 / D1
ARIZONA SCIENCE LAB 11/29/17 V40 AZ Science Lab 1 11/29/17 V40 AZ Science Lab 2 Arizona Science Lab: WORKING WITH WATERWHEELS Harnessing the Energy of Water! Institute Of Electrical And Electronic Engineers, Phoenix Section Teacher In Service Program / Engineers In The Classroom (TISP/EIC) “Helping Students Transfer What Is Learned In The Classroom To The World Beyond” Our Sponsors The AZ Science Lab is supported through very generous donations from corporations, non- profit organizations, and individuals, including: 11/29/17 V40 AZ Science Lab 4 Information Sources • For more information on renewable energy, waterwheels, simple machines, and related topics: • www.Wikipedia.com • www.mikids.com/Smachines.htm • www.waterhistory.org • www.youtube.com 11/29/17 V40 AZ Science Lab 5 Norias of Hama, Syria Orontes river ~ 400AD 11/29/17 V40 AZ Science Lab 6 The Science and Engineering of Waterwheels • History – Waterwheels date back to 400 AD! • Energy – Rivers: Kinetic and Potential Energy • Simple Machines – The Power of Leverage • Using Our Science Knowledge: Build a Waterwheel! • Today: Capturing the River – Hydroelectric Power 11/29/17 V40 AZ Science Lab 7 ENERGY What is it? Energy is the ability to do work. Can you name some common forms of energy? 8 AZ Science Lab 11/29/17 V40 What is Energy? Energy is the ability to do work The food we eat contains energy. We use that energy to work and play. Energy can be found in many forms: Chemical energy ElectricalMechanical energy Energy Thermal (heat) energy 11/29/17 V40 AZ Science Lab 9 Mechanical Energy has two forms: Potential Energy (P.E.) – Stored Energy, The Energy of Position (gravitational) Kinetic Energy (K.E.) – Active Energy, The Energy of Motion (motion of waves, electrons, atoms, molecules, and substances) 11/29/17 V40 AZ Science Lab 10 Potential Energy – P.E.