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General Discussion

13225 threads, 231943 comments (9 Viewing)

Compressing homemade methane

07/31/2014 by steamhammer
I'm looking for some advice pertaining to compressing methane. I would like to build a biodigester and collect the methane using an air compressor and...
Views: 5, Comments: 1
Last comment 07/31/2014 by SolarEagle

The Changing Engineering Workforce - Any Tips to Pass On

07/31/2014 by Don from Oz
"According to the U.S. Bureau of Labor Statistics, almost half the engineering workforce will be eligible for retirement in the next few years. A...
Views: 56, Comments: 9
Last comment 07/31/2014 by Gannet

Fascinating Planets Outside the Solar System

07/30/2014 by spacevudo
Exoplanets or "extrasolar planets" are planets found outside our solar system. They are designated by affixing a lowercase letter, starting from "b" t...
Pathfinder Tags: Exoplanet
Views: 31, Comments: 0

Button Hole Size/Shape

07/29/2014 by agua_doc
Does anyone have any current contact with the Clothing Manufacturing Industry? I have a question that seems truly inane, but I am asking it seriously,...
Views: 184, Comments: 12
Last comment 07/30/2014 by James Stewart


07/29/2014 by saeed ghajari
Can anybody help me to receive the latest revision of OSHA(occupational safety and health association?
Views: 110, Comments: 4
Last comment 07/30/2014 by Tornado
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Commercial Space

1781 threads, 3259 comments (0 Viewing)

Free Engineering Calculation Site

07/31/2014 by JanetLewis
Is any one have any Idea about the free igbt calculation site? I need it urgently. Have you guys checked out the new IGBT calculation tools at www...
Pathfinder Tags: IGBT inverter motion control POWER CONVERSION Power electronics ...
Views: 23, Comments: 2
Last comment 07/31/2014 by IdeaSmith

Natural Health and Beauty

07/29/2014 by Nichola
Coconut Oil This is the a lot of frequently acclimated additive in about all the bloom and adorableness products. This oil is affluent antecedent of...
Pathfinder Tags: health and beauty
Views: 23, Comments: 3
Last comment 07/29/2014 by CK INDIA

Providing petroleum drilling services and equipments

07/19/2014 by HDTC
Dear all, Thank you for reading this article. First of all, I have to say that this is a commercial advertisement.Second, I would like to say that th...
Pathfinder Tags: directional drilling drilling fluid petroleum drilling services
Views: 53, Comments: 1
Last comment 07/19/2014 by lyn

Metallized Ceramics for Vacuum Interrupters

07/17/2014 by michaelzhuo
Specifications Big Diametre Glazing & Metallized Ceramic Tubes 1.Good electrical insulation 2.Wear resistant 3.Corrosion resistant B...
Pathfinder Tags: Metallized Ceramics for Vacuum interrupters
Views: 10, Comments: 0

DBX Recovery Tool

07/04/2014 by romyymartin
Recovering corrupt Outlook Express files is not an easy task but RecoveryFix for Outlook Express recovery software is an easy way to repair DBX file...
Pathfinder Tags: DBX recovery
Views: 9, Comments: 0
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CR4 Feedback

578 threads, 10373 comments (0 Viewing)

Membership - Name Not Found in the Membership List

07/27/2014 by dhayanandhan
I am a Member in the CR4 from May 2008, from India. I have posted more than 1000 replies and 574 Updated discussions, and as on date, 25 Good Answers....
Views: 55, Comments: 9
Last comment 07/27/2014 by Tornado

Poof Again

07/20/2014 by lyn
I was going to try to document when CR4 goes away, but it's too often, and once it goes there's no way to tell how long it's going to be gone, that ti...
Views: 210, Comments: 16
Last comment 07/22/2014 by Kris

Why is CR4 Not Accessible During Mornings in Europe Almost Each and Every Day?

07/18/2014 by Andy Germany
That is the question, does anyone know why? ts been going on for some months, maybe am missing something already posted..... t appears to be from 7am...
Pathfinder Tags: CET server offline CR4
Views: 59, Comments: 10
Last comment 07/18/2014 by Andy Germany

Google Drive Violates CR4 Members' Privacy

07/14/2014 by europium mkII
To their credit CR4's admins take great pains to conceal members' private email addresses. Google, on the other hand, has no such compunctions. Google...
Views: 171, Comments: 6
Last comment 07/14/2014 by europium mkII

Where Did You Go?

07/12/2014 by ThatMitchell
Global Spec CR4 stopped appearing in my email inbox last week. What happened? Can I get it back? gk
Views: 36, Comments: 2
Last comment 07/18/2014 by ThatMitchell
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See all Blog Entries

Section Blogs

The Engineer's Notebook

323 blog entries, 5292 comments (0 Viewing)

Life is Random

07/30/2014 by HUSH
I'm sure that by now you've heard yet another Jurassic Park film will be released next year. This time around the dinosaurs run amok and eat people,...
Pathfinder Tags: dinosaur extinction life Mars
Views: 156, Comments: 6
Last comment 07/31/2014 by Rixter

Build a Better Fourth

07/02/2014 by HUSH
I may or may not have mentioned this before, but the Fourth of July is awesome. It's an unusual holiday here in the U.S., as it's our only federal h...
Pathfinder Tags: fireworks holiday July 4
Views: 267, Comments: 0

The Internet of Things

06/29/2014 by Chelsey H
Interesting stuff on the internet Happy 4^th of July! Image Credit: JD Hancock Going away for the summer? Consider checking out the World's Larg...
Views: 254, Comments: 1
Last comment 06/29/2014 by Kilowatt0
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Notes & Lines

18 blog entries, 112 comments (0 Viewing)

Acoustic Guitar Tonewoods

07/26/2014 by cheme_wordsmithy
I remember the day I received my acoustic guitar, and played it for the first time. In the moment, it seemed produced the most beautiful sound I had e...
Views: 139, Comments: 10
Last comment 07/29/2014 by Holzfeller

For Love of the Index

05/09/2014 by Hannes
If you're a literate human who's a (diligent) knowledge worker or (diligent) student, chances are you've used an index this week. Or at least you di...
Pathfinder Tags: books index indexing
Views: 125, Comments: 0

Wait...What'd I Just Say?

03/27/2014 by Hannes
Several months ago, an acquaintance decided to try out a speech recognition software program to cure writer's block. He found it to be quite "inte...
Pathfinder Tags: ambiguity natural language processing nlp words
Views: 528, Comments: 8
Last comment 04/02/2014 by Calnet42
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Caption This!

268 blog entries, 11636 comments (2 Viewing)

Caption This for 08/01/14

07/31/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to Phys for submitting this image.
Pathfinder Tags: Caption this engineering images funny images
Views: 21, Comments: 9
Last comment 07/31/2014 by lyn

Caption This for 07/25/14

07/24/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to Tom_Consulting for submitting this image.
Pathfinder Tags: Caption this electric engineering images funny images Water
Views: 556, Comments: 46
Last comment 07/30/2014 by Unredundant

Caption This for 07/18/14

07/17/2014 by Kaplin
This week's image: Be sure to vote for your favorite caption! Thanks to Captain Quirk for submitting this image.
Pathfinder Tags: airplane arrows Caption this engineering images funny images
Views: 574, Comments: 31
Last comment 07/23/2014 by Rixter
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TechnoTourist’s Engineering Expeditions

80 blog entries, 461 comments (1 Viewing)

Vacation Destinations for Engineers

07/17/2014 by SavvyExacta
What are your summer vacation plans? TechnoTourist has compiled a list of some destinations of engineering interest that have been featured on the b...
Views: 229, Comments: 11
Last comment 07/22/2014 by SavvyExacta

Castell de Bellver - Mallorca Spain's Circular Castle

11/02/2013 by SavvyExacta
Bellver Castle, or Castell de Bellver, is located in Palma de Mallorca and dates back to the 14^th century. This particular castle is unique because...
Views: 390, Comments: 0

Barcelona and the Influence of Antoni Gaudí' (Park Güell, Sagrada Familia)

10/11/2013 by SavvyExacta
My travels brought me to Spain a few weeks ago. Barcelona is a port city that was revived by hosting the 1992 Summer Olympic Games. But 100 years befo...
Pathfinder Tags: Gaudi Park Guell Sagrada Familia
Views: 335, Comments: 1
Last comment 10/11/2013 by PWSlack
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The CR4 Admin Blog

64 blog entries, 1028 comments (1 Viewing)

Why You May Have Fewer Posts & GAs

07/08/2014 by SavvyExacta
The team has been cleaning up CR4 a little bit. Your post and good answer totals may be lower because posts and comments from deleted threads are no l...
Views: 347, Comments: 26
Last comment 07/15/2014 by Kris

Posting Timeouts--Fixed?!

02/13/2014 As far as I can tell, the reason for the timeouts experienced by users trying to post to CR4 has been fixed. (Don't know what I'm talking about? Click...
Views: 369, Comments: 24
Last comment 02/20/2014 by adreasler

1,000,000th CR4 Comment Posted

02/10/2014 Since 2004, CR4 has been a community for people interested in engineering, science, and technology to converse and share ideas. On February 10, 2014...
Views: 551, Comments: 39
Last comment 02/24/2014 by tcmtech
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Defense & Security Technology

75 blog entries, 1158 comments (0 Viewing)

Sea Drone is Solar Powered

07/03/2014 by IHS GlobalSpec eNewsletter
Eco Marine Power's Aquarius USV (unmanned surface vessel) will be a trimaran covered with "marine grade" solar cells to charge its Li-ion batter...
Views: 219, Comments: 7
Last comment 07/08/2014 by europium mkII

Engineers Save the World--June 6, 1944

06/04/2014 by HUSH
Friday marks the 70^th anniversary of D-Day, June 6, 1944. It would be thoughtless to not mention the bravery of the American (and British and Canad...
Pathfinder Tags: D-Day June 5 military engineering WWII
Views: 408, Comments: 4
Last comment 06/05/2014 by passingtongreen

KAI Touts Aerospace Systems at Singapore Show

03/21/2014 by IHS GlobalSpec eNewsletter
The recent Singapore Airshow saw Korea Aerospace Industries marketing diverse military aerospace products. Most interesting was the Devil Killer small...
Views: 278, Comments: 0
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Challenge Questions

317 blog entries, 27118 comments (1 Viewing)

Space Trail: Newsletter Challenge (July 2014)

06/30/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: The path that a spacecraft follows when traveling to the moon is a distorted fig...
Pathfinder Tags: challenge question
Views: 2407, Comments: 20
Last comment 07/22/2014 by europium mkII

Rolling, Rolling, Rolling...: Newsletter Challenge (June 2014)

06/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: Two cylinders of equal length and radius are set at the same height on a ramp an...
Pathfinder Tags: challenge questions
Views: 3713, Comments: 138
Last comment 07/06/2014 by europium mkII

Supercooled Water: Newsletter Challenge (May 2014)

05/01/2014 This month's Challenge Question: Specs & Techs from GlobalSpec: We know that water freezes at 0º C in standard conditions. However, we also know...
Pathfinder Tags: challenge questions
Views: 3737, Comments: 37
Last comment 06/12/2014 by Golden_HVAC
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Animal Science

210 blog entries, 1914 comments (0 Viewing)

Ways to Care for Your Aging Cat

06/16/2014 by SwissMiss
One of my most cherished memories is the day I adopted my first cat. My younger self was delighted to have a new friend, and as we grew together ove...
Views: 366, Comments: 8
Last comment 06/20/2014 by SwissMiss

Jeepers, Creepers... a Different Kind of Peepers!

05/01/2014 by SavvyExacta
The birds are singing, the grass is greening, and the peepers are peeping. Spring has finally sprung here in upstate New York after a long, long win...
Pathfinder Tags: ANIMAL SCIENCE frogs hibernation peepers
Views: 323, Comments: 5
Last comment 05/02/2014 by lyn

Would You Do Anything for Love? Cardinals Will!

02/14/2014 by SavvyExacta
As you enjoy your morning coffee you gaze out the window and watch the birds at the feeder. But what's going on in the distance - is something attac...
Pathfinder Tags: bird behavior
Views: 538, Comments: 6
Last comment 02/19/2014 by Doggoneit
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The Standard

1 blog entries, 3 comments (0 Viewing)

Safety News:The Helmet Debate in Girls Lacrosse

06/12/2014 by KevinCassidy
Recently, the Florida High School Athletic Association (FHSAA) voted to require the use of helmets by high school girls lacrosse players in Florida st...
Pathfinder Tags: ANSI ASTM Head Protection helmet Lacrosse ...
Views: 153, Comments: 3
Last comment 06/17/2014 by phoenix911
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WoW Blog (Woman of the Week)

159 blog entries, 452 comments (0 Viewing)

Women Redefining Leadership in STEM and IT

05/10/2014 by Chelsey H
As of 2014, there is still a lack of female representation in science, technology, engineering, and mathematics. Women hold just about 32 percent of...
Views: 197, Comments: 3
Last comment 05/11/2014 by europium mkII

Top 10 Women Engineers and Scientists

10/18/2013 by CR4 Guest Author
Many women have made great contributions to science and engineering. Check out the list of the 10 below and read their biographies. Then, let us know:...
Views: 526, Comments: 8
Last comment 11/20/2013 by Tornado
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Roger's Equations

88 blog entries, 1117 comments (0 Viewing)

Why LiFi? by Roger Pink

05/08/2014 by Roger Pink
The Coming Data Crunch Everywhere you look nowadays, the world is becoming more mobile. Smart phone...
Views: 288, Comments: 2
Last comment 05/09/2014 by Rixter

New Dwarf Planet And Other Solar System News by Roger Pink

03/26/2014 by Roger Pink
- New Dwarf Planet Discovered - Astronomers have increased the size of the observable solar system after spotting a 450-km wide object orbiting the...
Views: 370, Comments: 7
Last comment 05/01/2014 by europium mkII

Oceans by Roger Pink

03/20/2014 by Roger Pink
The Great Unknown...Right Next To Us Although oceans and other bodies of water cover 70% of the Earth's surface, we are only just now beginning...
Views: 337, Comments: 6
Last comment 03/21/2014 by SolarEagle
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60 blog entries, 498 comments (1 Viewing)

Dangerous Drilling - Oil & Gas Rig Safety

03/06/2014 by cheme_wordsmithy
Crude oil and natural gas have over the last hundred plus years become critical to our way of life and economy. Not only do they satisfy a huge chun...
Views: 325, Comments: 2
Last comment 03/06/2014 by texasron

Titanic Sank Over A Century Ago, But The Story Lives On - 5 Possible Reasons Why Is It So Interesting Even Today!

10/13/2013 by CR4 Guest Author
On April 10, 1912, Titanic, the virtually unsinkable ship, embarked on its maiden voyage to never return again. It hit an iceberg deep in the night...
Views: 556, Comments: 27
Last comment 10/15/2013 by Yusef1
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What Is It?

60 blog entries, 1628 comments (0 Viewing)

What Is It? for 2/28/2014

02/28/2014 What is this stuff?
Views: 697, Comments: 30
Last comment 03/18/2014 by RufusVS

What Is It? for 2/22/2014

02/22/2014 What is this item? Two views are shown. Share your guesses below!
Pathfinder Tags: What is it?
Views: 843, Comments: 71
Last comment 03/02/2014 by Andy Germany

What Is It? for 2/15/2014

02/15/2014 What is this? Bonus points if you can guess where it is, too!
Pathfinder Tags: What is it?
Views: 729, Comments: 19
Last comment 03/06/2014 by steven phaneuf
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Great Engineers & Scientists

144 blog entries, 498 comments (0 Viewing)

U.S. Presidents Who Were Engineers

02/16/2014 by SavvyExacta
Monday is Presidents' Day in the USA. In honor of Washington and all other presidents we will take a look at those who contributed something to engi...
Views: 570, Comments: 18
Last comment 02/21/2014 by suresh sharma

Top 10 Greatest Engineers

09/20/2013 by CR4 Guest Author
Who are the greatest engineers of all time? Here's a list of 10. Click on the links to see their biographies. Then tell us: who's on your top 10 list?...
Views: 901, Comments: 36
Last comment 09/30/2013 by passingtongreen
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Physics In Film

6 blog entries, 52 comments (0 Viewing)

The Skeleton of Mechatronics

11/16/2013 by CR4 Guest Author
- The Science of Entertainment - Time and technology have done a great deal to boost the entertainment value of movies. From black and white silent...
Pathfinder Tags: mechatronics
Views: 328, Comments: 4
Last comment 11/17/2013 by SolarEagle
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"On This Day" In Engineering History

232 blog entries, 817 comments (0 Viewing)

October 31, 1941 – The Completion of Mount Rushmore

10/31/2013 by cheme_wordsmithy
One of the fondest memories I have from my "Out West" trip 6 years ago was arriving at the Mount Rushmore National Memorial in South Dakota. Though I...
Pathfinder Tags: monuments Mount Rushmore October 31
Views: 633, Comments: 6
Last comment 11/02/2013 by ronseto
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Other Blog Entries of Interest

Slo' Mo' Hat Cam

07/04/2014 posted in Workbench Creations
by Del the cat
I wanted to see how my arrows were flying from my bow, specifically flight arrows. A flight arrow presents a conundrum, you'd think you would want...
Views: 535, Comments: 67
Last comment 07/15/2014 by europium mkII

The Poisson Distribution by Roger Pink

02/26/2014 posted in Derivations
by Roger Pink
The Poisson distribution, named for Simeon Denis Poisson, is a discrete probability distribution that expresses the probability of a given number...
Views: 253, Comments: 0

Whistling Walnut!

12/28/2013 posted in Workbench Creations
by Del the cat
What to do with the walnut shells left over from Christmas? Make a whistling arrow . I'd been toying with the idea for ages, and if you try an...
Views: 652, Comments: 33
Last comment 01/02/2014 by artsmith

Detective Work On An Exploded Warbow

07/11/2013 posted in Workbench Creations
by Del the cat
It's often impossible to actually work out how and why a bow explodes. But this time I think I know! I was building a copy of a Mary Rose Warb...
Views: 768, Comments: 13
Last comment 07/14/2013 by lyn

Del's Lathe Refurb' pt 3

06/20/2013 posted in Workbench Creations
by Del the cat
I've done the back gears, I could have bought new gears, but I thought I'd 'make do and mend'. I replaced the small cog with a slightly larger one...
Views: 538, Comments: 16
Last comment 06/22/2013 by Del the cat

The One-way Speed of Light Controversy

06/13/2013 posted in Relativity and Cosmology
by Jorrie
The very title of this post may surprise and/or offend some relativistically minded readers. I will try to give a reason for this possible reaction,...
Pathfinder Tags: relativity speed of light
Views: 948, Comments: 15
Last comment 06/18/2013 by Jorrie