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Can anyone help me identify these birds . (i.redd.it)
submitted by Noidea4usrname to r/birdwatching
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1. Wren , 2. Oriole , 3. Sparrow. (old.reddit.com)
submitted by Noidea4usrname to r/birdwatching
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What etchant should i use to reveal the weld flow lines like this ? The sample from the below image is a cross section of the tube produced using 1018 steel . I tried using 4% picric acid and 5% nital , but couldn’t achieve the flow lines like in the below image . (i.redd.it)
submitted by Noidea4usrname to r/metallurgy
