| Aanderaa_Instruments Instruments and Sensors for Land, Sea and Air |
| Adcon_Telemetry_GmbH Provide meteorological sensors, but specialty is wireless telemetry. |
| Advanced_Designs_Corp_ Doppler Weather Radar and Weather Data Displays, Doppler Radar, Weather Radar, Doppler, Radar |
| Advanced_Sensing_Products ASP is a manufacturer standard PRTs, precision RTDs, and different types of thermocouples. |
| Alltec_Corp_ A manufacturer of lightning protection and grounding systems. |
| AllWeatherInc A source of weather sensors, environmental monitoring systems, data collection products, and display and recording devices. |
| Applied_Technologies,_Inc_ Manufacturer and supplier of scientific instrumentation, software, and systems for meteorological and atmospheric research. |
| Atmospheric_Radar_Systems_(ATRAD) Atmospheric Radar systems for scientific and commercial applications. |
| Axinum_Innovations_&_Technologies Manufacture of Siphoning Rain Gauges and Data Loggers |
| B__K__Consimpex_Meteorological_Systems Satellite remote sensing & metereological system integrators in India. |
| Belfort_Instruments Offer a variety of weather instruments for the measurement of Wind, Precipitation, Temperature, Humidity, Pressure, and Visibility. |
| BOLTEK A leader in affordable thunderstorm tracking technology and Lightning Detection Systems. |
| Campbell_Scientific_Ltd_ Professional weather monitoring products, including a full line of automated, research-grade weather stations. |
| Casella_CEL Manufacturer and supplier of meteorological equipment, weather stations, rain gauges, solar equipment and wind speed and direction. |
| Climatronics_Corp_ Meteorological systems for ambient surface and upper air weather stations and networks. Offering sensors for wind, temperature, humidity, rainfall, pressure, solar, ice, clouds and visibility. |
| Coastal_Environmental_Systems Coastal Environmental designs and manufactures weather stations, meteorological, environmental monitoring instrumentation, and data acquisition systems. |
| Columbia_Weather_Systems Makers of the Capricorn weather stations. Systems include wind speed and direction, temperature, barometric pressure, humidity, rainfall, leaf wetness, solar radiation and soil moisture. |
| Comptus_Inc_ Manufacturer of meterological instruments for measuring wind, rain, snow and other weather elements. |
| Corr-Tek_Idrometria Environmental Monitoring: Products for Sampling and Monitoring Water |
| Davis_Instruments_Corp_ Weather instrumentation for amateur and commercial boaters, farmers, meteorologists, hobbyists. Introductory Flash option. |
| Diplex_Instruments Manufacture, import and distribute meteorological and scientific instruments. Specialist in thermometers. |
| DWC_(Danish_Wind_Controller_A/S) Rugged wind sensors for critical environmental conditions. |
| Dynalab Manufacturer of Meteorological sensors and Automatic Weather stations |
| Dynamax,_Inc_ Provides instruments and sensors for plant, water, environment, and hydrology. |
| E+E_Elektronik Humidity and temperature transmitters, sensors, and data loggers that can be used for meteorology. |
| ELBW_Technology_SA, Designer and manufacturer of no moving parts Meteorological sensors |
| ELE_International Range of meteorological testing and monitoring equipment. |
| Enercorp_Instruments_Ltd A Manufacturer of Pressure, Temperature, and Humidity instrumentation. |
| Environdata Design, manufacture, and sale of weather stations and sensors. |
| EnviroTech_Sensors Specialize in the design, and manufacture of sensors used in environmental and industrial settings. |
| Fairmount_Weather_Systems Manufacturer of Meteorological & Hydrological Instruments. |
| Fidelity_Technologies_Corp_ Line of high-precision meteorological products and systems. |
| Fischer Manufactures measuring and recording instruments for meteorology and indoor climate. |
| FT_Technologies_Ltd Manufacturers of compact, rugged, low power ultrasonic wind sensors. |
| Gematronik_Weather_Radar_Systems Developer and manufacturer of doppler weather radar systems and weather data processing software. |
| GPSE Provides Data Logging and Weather Station solutions to the scientific, agriculture, and construction industries. |
| GRAW_Radiosondes Develops and manufactures GPS-based radiosonde-systems for upper-air measurements |
| High_Sierra_Electronics Meteorological & Hydrological Sensors & Gauges, including warning & response products and services. |
| Hovemere_Ltd Scientific instrument company specialising in Optical and Electronic Measurement Systems, for use in Research Applications. |
| Hukseflux_Thermal_Sensors For measurement of heat flux, thermal conductivity, thermal gradients and transfer coefficients, and particularly surface energy balance measurements in meteorology. |
By Roseann Krane, Monte Vista HS, Danville, CA, andstudents: Jefferson Ng, Mike Carns, and Amber Bullington, and Sherida Hare, Bellport HS, Brookhaven, NY, editor "Understanding symmetry is essential to the understanding of Escher artand understanding symmetry involves a familiarity with the movements thatmathematicians call transformations." (Jill and Walter Britton)Click to view the "Step byStep Tessellations" for a detailed explanation on tessellations. Click to print the "Step byStep Tessellations" for a detailed explanation on tessellations. Vocabulary: Tessellation - A tessellation is a pattern of one or more shapes,completely covering a two-dimensional plane. Picture a puzzle withpieces that have the same shape and size that fit together perfectly as ina square. (A circle would not be a shape for a tessellation becausecircles cannot fit together in a puzzle.) A tessellation is a patternthat is repeated. If we take squares and layer them on the floor, wecan cover the entire floor with them, without any space leftover.
Plane - Imagine a plane to be a tabletop with no thickness thatcontinues infinitely in all directions. Translation - If we move a figure to a new location by sliding it afixed distance in a fixed direction, the motion is called a translation. Rotation - If we move a figure to a new location by turning it abouta fixed axis, the motion is referred to as a rotation or a turn. Center ofRotation - The point or axis about which a figure is rotated is called thecenter of rotation. The angle through which the figure turns is calledthe angle of rotation.Reflection - If we move a figure to a new location by flipping itabout a fixed line the motion is called a reflection or flip. Thefixed line about which the figure is flipped is called the line ofreflection. (It is called a reflectionbecause if a mirror were placed along a line the transformed figure wouldcoincide with the mirror image of the figure in its original location.)Glide Reflection - This final transformation combines the motions ofreflection andtranslation to move a figure to its new location. By flipping it about a fixed line.By sliding it at a fixed distance in a direction parallel to that line.The motion is called a glide reflection.
Click on the following for a detailed explanation on:Step by Step Tessellations.How to use Java to create TessellationsSeeing the Tessellation Example of diamonds done with JavaSeeing the Java Tessellation source code.Student Exercises Modify the paint function to create a tessellation oftriangles. Modify the paint function to create a tessellation ofhexagons. Modify the paint function to create a tessellation ofoctagons and squares.Links about tessellations:World of EscherHan's ComputerArtSwarthmore Tessellation Tutorials Glide Reflections Tutorial Movies onTessellations Swarthmore Discussions ThreadStudent Workwith TesselmaniaStudent Workwith Paint ProgramsLesson PlanYou can contact me at : roseann@krane.netWeb site 