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  1. Replies
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    516

    It'll be gone for good soon: I hear developers...

    It'll be gone for good soon: I hear developers are going to build a block of units on the site. Here's another photo of the derrick in the background while a transport boat is being built for the US...
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    516

    Apologies if I've posted this before, this is...

    Apologies if I've posted this before, this is photo from a local sawmill that's about 140 years old in that location. There 's a railway siding at the base of this equipment and a riveted boiler at...
  3. Isn't it kind if de rigeur to have an old stereo...

    Isn't it kind if de rigeur to have an old stereo / speaker combination that looks like it was found in a skip bin for the workshop?. In the 1970's it would have been a valve AM radio bare chassis...
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    When I read the title, I thought it was one of...

    When I read the title, I thought it was one of these experiments:

    http://forgetomori.com/wp-content/uploads/2011/03/cyborg.jpg
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    601

    You can "see" infrared light sources by using...

    You can "see" infrared light sources by using your mobile phone camera as it has some infrared response even with the built in filters. This is a great way to see if your TV remote is faulty and...
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    Try pulling the bronze nut for the cross slide...

    Try pulling the bronze nut for the cross slide screw out, rotating it 180 degrees and reinstalling it (if it's possible for that model), it can make the screw stiff if misaligned. Also it's possible...
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    Wasn't there some guy who selectively fed...

    Wasn't there some guy who selectively fed squirrels based on some slight colour difference while leaving the other ones unfed. After a while they turned on each other "Lord of the Flies" style, one...
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    1,880

    I think CR-39 is a great lens material, when they...

    I think CR-39 is a great lens material, when they are ground to a prescription, only the rear surface closest to the eye is machined and ground. The front surface comes precoated with a scratch...
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    This was posted earlier, the 1949, 1955 and 1966...

    This was posted earlier, the 1949, 1955 and 1966 McPherson's catalogues: Index of /www.titaniumstudios.com/titaniumstudios.com/tooljunkie/paper
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    If you tap threads from below instead of from the...

    If you tap threads from below instead of from the top, you'll get left hand threads.
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    883

    Averaging would be the case for an analogue style...

    Averaging would be the case for an analogue style multimeter with a needle, with a digital meter it would be a random set of readings between zero and peak voltage.
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    883

    If it's a bog stock bridge rectified transformer...

    If it's a bog stock bridge rectified transformer based charger, then the output has significant ripple, dropping to zero at twice the mains frequency. This gives a false reading on your digital...
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    883

    10.8 Volts is what you'd expect if one cell of...

    10.8 Volts is what you'd expect if one cell of your 12V battery went short circuit and died and you had a good charge in the remaining 5 cells: 2.2V x 5 = 11V.
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    815

    As a ten year old kid getting started in radio I...

    As a ten year old kid getting started in radio I would have been all over that battery. I was given a lot of vintage radio stuff that I promptly pulled apart: HAC-1 radios from DC3 aircraft.
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    World War Two Coastwatcher Battery

    Today I saw an interesting artifact: a World War Two Coastwatcher radio battery. The Coastwatchers were civilians placed around various pacific island locations along with radio equipment to observe...
  16. If you were feeling bipolar you could lick the...

    If you were feeling bipolar you could lick the lithium carbonate layer. :crazy:
  17. It's still used around here for power poles at...

    It's still used around here for power poles at least, according to Wikipedia CCA treated timber uses 0.6% to 6% of copper chrome arsenate so I'd expect the arsenic content at the higher end to exceed...
  18. Every human has over a gram of arsenic in their...

    Every human has over a gram of arsenic in their body as a trace element, I'm pretty sure 0.37% won't be an issue considering there are many more products containing larger amounts, like treated green...
  19. Monash University in Australia came up with trace...

    Monash University in Australia came up with trace amounts of arsenic added to magnesium to give cathodic protection and very good corrosion resistance.

    'Poisoned' alloy the metal of the future ›...
  20. The Holden Kingswood HZ 4WD overlander is a...

    The Holden Kingswood HZ 4WD overlander is a pretty cool vehicle, only 120 were built .

    The Amazo Effect: Holden HZ Overlander
    ...
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    Cable manufacturers do publish detailed manuals...

    Cable manufacturers do publish detailed manuals for their products, the link below is for Australian standards for cable. You can see that cables in walls, in walls with insulation, in sunlight, with...
  22. I eventually found a spec for some Rex MM I had:...

    I eventually found a spec for some Rex MM I had: it turned out to be a World War 2 special formulated to substitute for harder to get alloying elements.

    Edit:
    Managed to find a description in a...
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    We used to joke about the crazy goings on at the...

    We used to joke about the crazy goings on at the laundromat across the road being caused by too many fumes. When they went under, there were drums of used Perc left behind that we were able to get...
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    Tetrachloroethylene/Perchloroethylene is a heavy...

    Tetrachloroethylene/Perchloroethylene is a heavy solvent with a low evaporating point used in dry cleaning machines. They run like a sealed closed cycle vapour cleaning machine to prevent worker...
  25. The capacitors I used were about 6" x 3" x 1.5"...

    The capacitors I used were about 6" x 3" x 1.5" thick paper in oil type capacitors, engineered for the job. Welder capacitors will have thicker plates to handle the higher current flows involved so...
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