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Lakehead University, McMaster University, Dr G. W. Williams Secondary School
  • Li-Ion 18650 Upgrade for WelchAllyn Opthalmoscope/ Oroscope/ Auroscope

    any chance you might share you Li ION battery details? The instructable seems to be about building a spacer. Thanks

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  • Make Your Own Ferrite to Improve Magnetic Fields

    Nice instructable. Sorry if I missed a comment about this, but sodium silicate solution will harden when exposed with carbon dioxide. punch a few tiny holes through the toroid and flush with CO2. Hardens up much faster. Typically used for cores in hollow castings. The other thing to consider is to put the toroid into a vacuum chamber..... that will help consolidate the ferrite / Sodium Silicate mix. *sodium silicate is also known as "Water Glass" and used in pottery, concrete sealing and many other places! Good luck Doug

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  • My $135 Wood Fired Pizza Oven!

    you might seal it with Water Glass... aka Sodium Silicate Solution. It's fine with head and will seal the concrete with a natural look. I'd be a bit cautious with all those SS needles. If you get any spalling, you might find a needle where you don't want it to be :) Nice build! Thanks for sharing the instructable with us.

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  • Homemade Liquid Nitrogen Generator

    thanks for the reply. Am I correct, those are old coaxial anesthetic sets you are using to scavenge the atmospheric nitrogen gas? I'm not sure that the "ordinary" phase change refrigerator will be possible but a dual compressor using Ethylene in the 2nd stage can get to -100C fairly easily. That would be a heck of a precooler. That being said, I was thinking of taking stainless steel corrugated tubing and making a vacuum insulated line to house the stainless steel high pressure compressor outlet... I think that will make the regenerative cooling much more efficient. Thanks again,Doug

    your points, in general are well taking BUT, we are not liquefying Air. We are liquefying 98+% nitrogen. Less efficient, (as compared to air) but the risk of producing significant liquid oxygen is negligible. The other thing to consider is that the IMSmooth clearly has the garage door open. You are more likely to come to harm transporting a Dewar filled with liquid nitrogen in a closed vehicle. As far as "oxygen toxicity", no - not at atmospheric pressure. Oxygen becomes toxic when it is breathed under pressure ie in diving. The biggest risk here is the nitrogen is contaminated with argon, because this system won't separate this. Argon is not going to be a problem for most of us,

    I found some on eBay. Good price. Haven't used it yet since I have a membrane separator now. That being said, did you do any calculation on how long a regeneration path you needed for 300bar? I see you are using used coaxial Bain Circuits as part of your regeneration pathway. Is the nitrogen going back into the compressor really significantly colder than ambient? Doesn't the act of compression heat it up significantly? I'm looking to use a cheap 300bar compressor with limited output but wondered if I could get away with a well insulted 25' pathway. ThanksDoug

    for the record, the gas doesn't cool because of a change of state.... it cools because of the Joule-Thompson effect where high pressure gas is allowed to escape to atmospheric pressure through a throttling valve. look at this: https://link.springer.com/article/10.1007/s10909-0...it is the pressure differential and regenerative cooling that ultimately liquefies the gas. so, the bigger the differential, the better the result. Also, the efficiency of the system increases when liquefing air rather than pure nitrogen.

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  • How to Make Indian Restaurant Curry Base - the Secret to Making Multiple Batches of Curries Quickly

    They’re a lot like a a famous British Indian Curry forum BIRcurries.co.uk. But they have a lot of derivatives there for specific curries.

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  • en2oh commented on antoniraj's instructable Portable Laminar Flow Hood
    Portable Laminar Flow Hood

    Having worked in a glove box for a long time during my chemistry training, the other role for the glove box is to control reactive atmospheres. But from the mycology perspective, the ability to simply spray down the interior with 15% H2O2 followed by a positive pressure atmosphere of HEPA filtered air is certainly anything but a waste of time. Much of what is represented as a laminar flow chamber is really a box with a HEPA filter, blowing filtered air across the sterile field.

    hi there, nice indestructible, but am not sure how you are defining laminar flow.certainly this is a positive pressure hood. It is also HEPA filtered. But laminar flow? I don't think so. The air coming out of a HEPA filter is highly turbulent. Can you clarify this for me?

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  • en2oh commented on imsmooth's instructable Nitrogen Gas Generator

    I've taken a little different approach. After months and months of disappointment looking for a supplier, I turned my hopes to ebay. eventually a 20kg CMS 240 appeared on eBay for a reasonable price (~$200 + $50 shipping) appeared.

    the spent gas is 'enriched' it is not particularly concentratedso, no - it won't work

    just got (finally) 20kg of CMS-240 for a psa nitrogen generator. if you had to do it again, anything you'd change? ie pressure level for the beds etc? I'm thinking of repurposing a dead oxygen concentrator to change the bed to CMS. Any suggestions?Any new projects ahead or is the OR and real life getting in the way?

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  • this is a nice project but i think you've missed an important part. A glove box traditionally is +ve pressure with an inert atmosphere ie nitrogen gas. Similarly, the side tunnel serves to allow the transfer of items from atmospheric conditions to the inert glove box. there needs to be a second door that seals the main box when the side tunnel is open (and only opens after the tunnel is purged. On a side note, can you please detail the salt solution humidity regulation system? I'm not familiar with the setup.ThanksDoug

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  • en2oh commented on drboom's instructable flash powder

    for the record, I'm a chemist and a physician. No particulate is especially good to inhale HOWEVER, hard rock miners used to get aluminum inhalation therapy to treat silicosis. Aluminum dust is a pulmonary irritant. While I've heard of asbestosis and silicosis, we didn't get much training on the dangers of "aluminosis". ?There is a lot that is unknown in the world of occupational health and welfare. That being said, there is no capris on between inhaling asbestos and inhaling aluminum powder. Where did you ever get such an idea?

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  • If you're interested in something different - texture-wise, try short ribs sous vide.I had twice braised Kalbi style short ribs at Allan Wongs in Hawaii. They were brilliant! I tried to duplicate this using a 48 hr cooking time at 52C. Briefly seared before going in, they were beautiful. I finished them with a reduction of the marinade and broiled them for 10 minutes to firm up the glaze. Mouthwatering and sooooo easy to do. Well worth the effort. Nitrous

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  • Is it my imagination, or did you use boneless short ribs at one point in the photos?When you braise your ribs, wouldn't you typically use a lower temperature? 350F will boil the braising liquid - not really your intent here, is it?Otherwise, a nice instructable!thanks

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