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Cake day: June 4th, 2024

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  • gnu@lemmy.ziptoScience Memes@mander.xyz•Love Wins
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    3 months ago

    The better solution is getting a sparkie to install a male socket (with protective cover) for power inlet if you’re anticipating needing a genset on any regular basis. While they’re at it get them to also install an isolating switch so you can easily avoid backfeeding power into the grid while keeping the house powered.





  • gnu@lemmy.ziptoScience Memes@mander.xyz•Uh well actually-
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    6 months ago

    I had one of these earlier tonight which was asking which of the pictured animals came from eggs. Only after clicking on the various birds and submitting (success) did I notice there was also a crocodile. I then really wanted to be able to redo it with the crocodile included and see if it knew crocodiles also come from eggs.


  • gnu@lemmy.ziptoScience Memes@mander.xyz•*Permanently Deleted*
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    6 months ago

    I remember one time when I was a kid and had read something mentioning spark gap transmitters. I of course found a bit of wire (tie wire because that’s what came to hand, not anything insulated) and a radio and was playing around with a 9v battery making little sparks by shorting it with the wire and hearing the radio crackle in response. What I then thought was that if the little battery was making a noticeable effect then a bigger battery would obviously be better.

    I got one of the drill batteries and shorted that out with my bit of wire to make a better spark and proceeded to discover that resistive heating is a thing and thin tie wire connected even briefly to a high discharge battery will get very hot very quickly. I ended up with a nice blister line across my fingers and a scar for a few years showing the position I’d been holding the wire…



  • gnu@lemmy.ziptoScience Memes@mander.xyz•*Permanently Deleted*
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    11 months ago

    The primary factor is that 120mm is not the actual focal length of the lens in the phone, that will be a considerably smaller focal length that happens to give the same field of view as a 120mm lens on a full frame camera (i.e. the same sensor size as a 35mm film frame). The phone uses a much smaller sensor than this hence the smaller focal length for the same FoV.

    Another thing that helps is using a telephoto lens design - including this lets you create a lens noticeably shorter than its focal length.

    When the lens would still make an overly wide phone despite all this that’s where the periscope lens design as others have already mentioned comes in.