Curlin’

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Curlin’

February 1, 2025
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Sport and WellbeingStandards Scotland

The term “curling” is thought to derive from the way the stone moves and “curls” as it travels over the ice. The key feature of curling that sets it apart from other ice sports is the deliberate rotation, or “curl,” applied to the stones as players release them. This rotation causes the stone to curve or “curl” on its path down the ice, adding an element of strategy to the game.

The precise origin of the term is not definitively known, but it likely emerged organically as people described the action of the stones on the ice. The word “curling” has been associated with the sport for centuries, and as the game evolved and gained popularity, the term became firmly established.

The concept of curling is integral to the sport’s strategy, as players use the curl to navigate the stones around guards and other stones strategically placed on the ice. The unique way in which the stones move and interact with the playing surface is one of the defining characteristics of curling, and the name captures this distinctive feature

World Curing Mixed Championship 2024

Scientific American: Why Do Curling Stones Curl?

A curling facility typically consists of several key components to support the sport and provide a suitable environment for players and spectators:

  • Flooding equipment, refrigeration for 3 degrees C, fine mist sprayers, ice planer, infrared thermometers.
  • The playing surface is called a “sheet,” and it is a rectangular area of ice where the game is played. Each sheet is divided into several sections called “curling houses,” which are the target circles.
  • Curling stones are made of granite and weigh around 38 to 44 pounds. Each team has eight stones, and players take turns sliding them down the ice towards the target area, known as the House.
  • The house is the target area with concentric circles marked on the ice. The center of the house is the “button,” and the circles are used for scoring points.
  • The hacks are footholds on either end of the sheet where players push off to slide the stones. The player in control of the stone uses the hack as a starting point for their delivery.
  • Brooms, also known as brushes, are used by players to sweep the ice in front of the sliding stone. Sweeping can affect the stone’s trajectory and speed.
  • A scoreboard is essential for keeping track of the score in a curling game. It typically displays the current score, the end in progress, and other relevant information.
  • Players use locker rooms for changing into their curling attire and storing their personal belongings.
  • A designated area where players can warm up before a game. It may include stretching space and possibly a small practice sheet.
  • A facility usually has a clubhouse or main building that includes amenities such as viewing areas, meeting rooms, a bar, and possibly a restaurant.  In the case of the Windsor Curling Club: Scotch Whiskey
  • Equipment like ice resurfacers or Zambonis are used to maintain the quality of the ice surface between games.

The origin of curling is sketchy but this much is agreed upon:  Curling is thought to have originated in Scotland, and its roots can be traced back to medieval times. The first written record of curling dates back to 1541 in the records of the Scottish city of Paisley, where a challenge was issued for a contest on the ice between two rival churches.

The early form of the game involved players sliding stones across frozen ponds and lochs, attempting to reach a target. Over time, the sport evolved, and rules were established. Early versions of curling stones were likely rudimentary compared to the polished granite stones used today.

Curling gradually gained popularity in Scotland and spread to other parts of the world, especially among Scottish immigrants. The sport found a home in Canada in the 18th century, where it has become particularly popular. The first curling club in North America, the Montreal Curling Club, was established in 1807.  The Detroit Curling Club was established in 1840; one of the oldest curling clubs in the United States, owing much to its across the river relationship with Windsor Canada.

 

 

Elephant House Coffee

January 31, 2025
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Located on George IV Bridge, near the heart of the city’s historic Old Town. It is perhaps best known as one of the places where J.K. Rowling is said to have written parts of the early Harry Potter books.

Launch of Scotland Street Coffee

Scotland

BSI Group | Buildings & Construction

Stray Voltage: Sources and Solutions

January 31, 2025
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Michigan State University

 

Stray Voltage: Sources and Solutions

Truman C. Surbrook – Norman D. Reese – Angela M. Kehrle

 

Abstract.  Stray voltage is caused by voltage drop and ground faults and may have its origin on the primary electrical distribution system or on the customer’s secondary electrical system. The rms value of the neutral-to-earth voltage along a primary distribution line may be at a value of zero some distance from the substation depending on the condition of the conductor resistances, grounding resistances, and the amount of load. Neutral-to-earth resistance is not the cause of stray voltage; however, the value of this resistance to earth at a particular location will affect the level of stray voltage. A four-wire single-phase feeder system supplying farm buildings from a single metering point is effective in preventing on-farm secondary neutral voltage drop, provided the four-wire system is extended to all farm loads, and provided no high-magnitude ground faults are present. Isolation of the primary and secondary neutral systems at the distribution transformer is effective in preventing off-farm sources from entering the customer’s system. This separation may be accomplished using a number of commercially available devices.

CLICK HERE for access to the entire paper

The Barbie Standard

January 30, 2025
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The Struggle for Control of Mother’s Day

January 30, 2025
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Standards West Virginia

CLICK IMAGE

Mother’s Day is celebrated on different days in different countries and regions. However, here is a list of some countries and the dates:

United States: Second Sunday in May
United Kingdom: Fourth Sunday in Lent
Australia: Second Sunday in May
Canada: Second Sunday in May
New Zealand: Second Sunday in May
India: Second Sunday in May
Mexico: May 10th
Japan: Second Sunday in May
France: Last Sunday in May or First Sunday in June
Germany: Second Sunday in May
Italy: Second Sunday in May
Brazil: Second Sunday in May
Egypt, Mother’s Day is celebrated on March 21st.
Israel, Mother’s Day is celebrated on the 30th day of the Jewish month of Shvat, which usually falls in February.
India, Mother’s Day is not an official holiday, but it is celebrated on the second Sunday of May, the same as in the United States.
Japan, Mother’s Day is celebrated on the second Sunday of May, but it is not a public holiday.
South Africa, Mother’s Day is celebrated on the second Sunday of May, the same as in the United States.
Thailand, Mother’s Day is celebrated on August 12th, which is the birthday of Queen Sirikit, the current queen consort of Thailand.

 

Electrical heat tracing: international harmonization-now and in the future

January 30, 2025
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Electrical heat tracing: international harmonization-now and in the future

C. Sandberg

Tyco Thermal Controls

N.R. Rafferty – M. Kleinehanding – J.J. Hernandez

E.I. DuPont de Nemours & Company, Inc 

 

Abstract:  In the past, electrical heat tracing has been thought of as a minor addition to plant utilities. Today, it is recognized as a critical subsystem to be monitored and controlled. A marriage between process, mechanical, and electrical engineers must take place to ensure that optimum economic results are produced. The Internet, expert systems, and falling costs of instrumentation will all contribute to more reliable control systems and improved monitoring systems. There is a harmonization between Europe and North America that should facilitate design and installation using common components. The future holds many opportunities to optimize the design.

CLICK HERE to order complete paper

 


Heat Tracing Installation

Industrial electroheating and electromagnetic processing

Pipe Heating

Heat Tracing

Outdoor Deicing & Snow Melting

January 30, 2025
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Electrical Safety

“Snow at Argenteuil” | Claude Monet (1875)

Today our focus turns to outdoor electric deicing and snow melting wiring systems identified as suitable for the environment and installed in accordance with the manufacturer’s instructions.  They work silently to keep snow load from caving in roofs and icicles falling from gutters onto pedestrian pathways.

While the voltage and ampere requirement of the product itself is a known characteristic, the characteristic 0f the wiring pathway — voltage, ampere, grounding, short circuit, disconnect and control — is relatively more complicated and worthy of our attention.   Articles 426-427 of the National Electrical Code is the relevant part of the NEC

Free Access 2023 National Electrical Code

Insight into the ideas running through technical committee deliberations is provided by a review of Panel 17 transcripts:

2023 NEC Panel 17 Public Input Report (633 pages)

2023 NEC Panel 17 Public Comment Report (190 pages)

We hold Articles 427 in the middle of our priority ranking for the 2023 NEC.   We find that the more difficult issues for this technology is the determination of which trade specifies these systems — architectural, electrical, or mechanical; covered in previous posts.   Instead, most of our time will be spent getting IEEE consensus products in step with it, specifically ANSI/IEEE 515 and IEEE 844/CSA 293.

Comments on the Second Draft of the 2026 NEC will be received until April 18th.

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We collaborate with the IEEE Education & Healthcare Facility Committee which meets online 4 times per month in European and American time zones.  Since a great deal of the technical basis for the NEC originates with the IEEE we will also collaborate with IEEE Standards Coordinating Committee 18 whose members are charged by the IEEE Standards Association to coordinate NFPA and IEEE consensus products.

Issue: [19-151]

Category: Electrical, Energy

Colleagues: Mike Anthony, Jim Harvey, Kane Howard, Jose Meijer


LEARN MORE:

IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Commercial Applications

844.2/CSA C293.2-2017 – IEEE/CSA Standard for Skin Effect Trace Heating of Pipelines, Vessels, Equipment, and Structures–Application Guide for Design, Installation, Testing, Commissioning, and Maintenance

 

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