How to Build a Biosand Water Filter Using a Wood Mold

March 23, 2016 by kris de decker Filed Under: DIY, Random, Water

biosand filtersBiosand Filters use sand, gravel, and natural biological process to filter out contaminants in water, making it safe for drinking. They’re a great low-tech drinking water solution:

  • No electricity or running parts to operate the filter
  • Made with 100% locally available materials (unlike larger community based systems where foreign parts typically need to be imported)
  • Labor intensive NOT capital intensive
  • Very durable, can last more than 25 years if maintained properly
  • Little maintenance required
  • Very effective for removing bacteria, protozoa, helminths from water and reducing turbidity

The main problem with concrete biosand filters is they require a heavy, expensive steel mold to make. [Read more…]

DIY Tools that Serve Disabled People’s Unique Needs

March 22, 2016 by kris de decker Filed Under: DIY, Random

low-tech hacked prosthetics

“In response to a heart attack, Cindy experienced an adverse reaction to medication and multiple organ failure. These complications resulted in amputations involving all four limbs: both of her legs below the knees and varying amounts of each of her fingers. With time, though, Cindy regained her ability to walk and started to find a “new normal.” She got great care from occupational therapists, physical therapists, physicians, and prosthetists.

But she found that the standard tools provided to her, even at a top-flight rehab hospital, didn’t facilitate some of the most important things she wanted to recover—how to write a thank you note, feed herself, put on makeup and jewelry, turn the pages in a picture book as she reads to her grandchildren. So Cindy started to design and build what she needed. From small hacks on her hand cream jar to repurposing cable ties for pulling out drawers and salad tongs for holding a sandwich, Cindy has embraced an everyday engineering ethic that she never thought possible. [Read more…]

Hand Crank Marble Machine

March 3, 2016 by kris de decker Filed Under: Art, Human power, Musical Instruments

low-tech music“The Wintergartan Marble Machine, built by Swedish musician Martin Molin and filmed by Hannes Knutsson, is a hand-made music box that powers a kick drum, bass, vibraphone and other instruments using a hand crank and 2,000 marbles.”

Read more at Wired: Wintergatan’s ‘Marble Machine’ makes music with 2,000 marbles.

Transcontinental Old School Cycle Race

March 1, 2016 by kris de decker Filed Under: Bicycles, Bikes, Racing

transcontinental cycle race

“In the early days of bicycle racing there was a time when plucky riders took on long hard races alone with no team cars and soigneurs to look after them.  They were hardy and desperate men who ate what they could find, slept when they could and rode all day.  They weren’t professional athletes or men of means, they were “mavericks, vagabonds and adventurers” who picked up a bicycle and went to seek their fortune.

The founders of the Tour de France wanted to create a race of thousands of miles of cycling, whatever the weather and road conditions where “even the best will take a beating”  Often they would race long into the night to distances of over 400 km each day in stages that would take more than 18 hours.  Henri Desgrange, the father of the tour once noted that “the ideal Tour would be a Tour in which only one rider survives the ordeal.”

Somewhere along the way from a variety of influences, the grand tours changed to become what they are today; a race of the elite, held apart from the common cyclist by budgets, sanctions and industry.  Don’t get us wrong, the Grand Tours as they are now are great and exciting things.  We however also like the old way where a rider can simply pick up a bike, shake hands on the start line and race thousands of miles for the pure satisfaction of sport and no other motive but for the learnings of one’s self.”

The Transcontinental is a low impact, self supported cycle race. Now in it’s 4th year, it will travel between Geraardsbergen in Flanders and Canakkale in Turkey passing through control points in the Auvergne region of France, Switzerland, the Dolomites in Italy and Durmitor national park in Montenegro. Entries for 2016 are closed, but the organisers are looking for volunteers, who will be eligible for a priority application in next year’s race.

The Internet in a Box

March 1, 2016 by kris de decker Filed Under: Access to information, Internet

internet accessLow-Tech Magazine and No Tech Magazine have given permission to the WiderNet Project to distribute all of our content via the eGranary Digital Library to people lacking Internet access.

The WiderNet Project is a non-profit organization affiliated with the University of North Carolina – Chapel Hill that promotes low-cost information and communication for underserved populations.

The eGranary Digital Library, also known as “The Internet in a Box”, is an off-line information storehouse that delivers educational resources to people living in underserved areas of the world.

  • In developing countries, many of the universities, schools, clinics and hospitals have no Internet connection.
  • Institutions that are connected to the Internet have such limited bandwidth that they cannot offer free Web browsing to the majority of their staff and students.
  • Bandwidth in Africa can cost up to 100 times what it costs in the U.S., so for some organizations a slim Internet connection can consume the equivalent of one-half their operating budget.
  • Even for those individuals who have the wherewithal to pay for Web browsing, the experience can be frustratingly slow — it can take hours to download a single audio file.

The eGranary Digital Library addresses these issues by moving a large assortment of educational Web documents onto the subscriber’s local area network (LAN) so that the documents can be made available to everyone within the institution freely and instantly.

Related article: How to Build a Low-tech Internet.

Driverless Cars Could Increase Reliance on Roads

February 27, 2016 by kris de decker Filed Under: Cars

google self driving carDriverless vehicles could intensify car use — reducing or even eliminating promised energy savings and environmental benefits, a new study finds:

  • A 5 to 60 percent increase in car energy consumption due to people choosing to use highly automated cars in situations where they would have previously taken alternative transport (e.g., trains).
  • People who currently find it difficult or impossible to drive, such as the elderly or some people with disabilities, will have increased access to road transport with the advent of the new systems, resulting in an estimated 2 to 10 percent increase in road energy use for personal travel.
  • Possible higher speed limits because of the improved safety of autonomous cars (7 to 22 percent) and demand for heavy extra equipment in driverless cars such as TV screens and computers (0 to 11 percent) might also tend to reduce efficiency savings.

Read more: Help or hindrance? The travel, energy and carbon impacts of highly automated vehicles, Transportation Research, Volume 83, April 2016. Summary: Driverless cars could increase reliance on roads. Via Road.cc. Picture: Google. Previously: Self-driving cars: A coming congestion disaster?