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  1. Replies
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    963

    All those aluminized front surface mirrors get...

    All those aluminized front surface mirrors get destroyed over the next few months after a fire, either from water or from powder extinguishers causing corrosion, even the lens antireflection coatings...
  2. Looks like the solvent used to clean the metal...

    Looks like the solvent used to clean the metal evaporated and caused condensation in a hot humid environment.
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    963

    I saw a 1 week old $10K photocopier that had...

    I saw a 1 week old $10K photocopier that had smoke damage, there was dark tar-like deposits all over the internal sheet metal, optics and electronics. Over time, the deposits corroded everything. If...
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    Some of the Colchester clones cut costs by...

    Some of the Colchester clones cut costs by leaving out the forward-reversing clutch assembly and simply reversed the motor. This meant that trying to perform an instant reverse of the spindle like a...
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    Some of the woodworking machines like those made...

    Some of the woodworking machines like those made by Wadkin had truly massive motors with tiny horsepower specs as they were 8 or 16 pole or something like that. In fact if anyone has connection data...
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    I did watch that video from start to finish (and...

    I did watch that video from start to finish (and enjoyed it), it looks like older methods of battery repair survive to this day: the technique of using a carbon arc rod to melt lead on a battery...
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    That's how we used to join the terminals for 48...

    That's how we used to join the terminals for 48 Volt strings of telephone exchange batteries, you'd bolt one terminal to the next cell's terminal and then clamp a mould made from aluminium angle to...
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    1,572

    I've heard of a pump at a mine site being powered...

    I've heard of a pump at a mine site being powered off junk pile 2, 3 and 5 Hp motors, they were all the same RPM and were connected to the pump via belts and pulleys. A clamp meter confirmed they...
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    They are mostly BS, there are plenty of tests on...

    They are mostly BS, there are plenty of tests on Youtube where the rats ignore the devices to eat seeds beside them.
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    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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    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...
  12. 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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    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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    433

    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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    6,333

    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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    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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    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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    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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    936

    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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    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...
  25. If you were feeling bipolar you could lick the...

    If you were feeling bipolar you could lick the lithium carbonate layer. :crazy:
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