| Tiling_Plain_and_Fancy Tiling from the mathematical and historical viewpoint by Steve Edwards. Provides a number of examples of various types of tiles that tile the plane and includes periodic tiling plus Penrose's aperiod |
| Tilings_and_Geometric_Ornament Applying principles of computer graphics to the creation of geometric ornament, as a continuation of the tradition of ornamental design using modern tools and algorithms. |
| Totally_Tessellated An introduction to tessellations explaining the basic underlying mathematics, and with many examples from real life. |
| 17_Wall_Paper_Symmetry_Groups_to_Create_a_Regular_Division_of_the_Plane Graphics. |
| Wallpaper_Groups Images and descriptions of the 17 plane symmetry groups. |
| William\'s_Geometric_Construction_Page Activities to create patterns using simple resources, such as making equilateral triangle from a circle. Suitable for upper primary and lower secondary ages. |
| 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. |
