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About Externet

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  • Gender
  • Location
    Mideast U.S.
  • Interests
    Old Cadillacs, scuba.
  • College Major/Degree
    Electronics engineer, audio recording engineer.
  • Favorite Area of Science
  • Biography
    Plain old fart tells it all.
  • Occupation
    Retired from electronics and shrimp farming.

Recent Profile Visitors

24883 profile views
  1. The sea of plastic...

    Looking at the subject from an engineering point of view, as posts comment on the use of waste plastic as road construction material additive... Any plastics expert that can confirm if this is possible ? : Melting mixed types of thermoplastic as collected, at a temperature that all become fluid in a cotton sugar type of machine to create fractional mm fibers to mix with concrete, asphalt, even soil ? (No need to painfully classify types of plastic ) (Do not know if such is the process to make pillow fillings and alike) Would provide a 'rebar' type of reinforcing. -If this post should be moved to engineering, please let me know to open a proper thread-
  2. Any creative smart suggestions ?

    Thanks. Adding magnetic material would destroy the compass ability to aim properly, if I understand you.
  3. Any creative smart suggestions ?

    It has to move with the compass dial as one piece, shifted in heading.
  4. Any creative smart suggestions ?

    Thanks. Nothing wrong with the markings on the compass dial, just need an extra shiftable disk on top, like on the last picture. Perhaps I should look for a dry compass with openable cover, shift the added disc and close lid.
  5. Any creative smart suggestions ?

    Thanks. No, but I prefer to 2D print such protractor markings on a transparency film as for 'overhead' projectors. Cutting teeth is a good idea, a manual setting/rotating knob is preferred. What are these ? Anyone knows ?
  6. Hi all. Headache is possible. Am after ways to attach a properly sized plastic disc like this on top of the flatty portion of a marine compass dial : And being capable of adjusting its bearing in respect of the compass bearing. Yes, disasembling the compass, install it, and reassemble once. The hard part is the added 360o ruler disc (how is it called?) should be positionable from the outside. As when the compass indicates a -say 50 degree heading- the added disc to indicate a chosen shift -say aiming a 230o heading- Perhaps some perforation or method for halting the compass, and a knob? for the disc as way to turn the (friction? mounted) disc respect to it could be in your skills ? It is likely a sealed dome, filled with fluid.
  7. Mu metal box

    I would say the magnetic field will be contained and follow the mu-metal path with minimal field outside it. Your sketch should define/identify the colored sections to better understand you.
  8. Vintage vacuum toy...

    Hi. The spring loaded button under, when pushed, releases the tension of strings that keeps the puppet standing up. A 3D printer would not re-create the bladder balloon inside that under vacuum collapses releasing the strings... better buy the push button puppet and install a bladder instead... Was looking for its name, vendor, if they exist now. Just nostalgic.
  9. Vintage vacuum toy...

    Hi. By ~1960, dad installed a wooden donkey on his VW dash. Collapsed and stood by engine vacuum. Similar to the 'push button' puppets that I can only find; as searches with the 'vacuum' term in english default to 'vacuum cleaner' Looked like the yellow based, without the under button, but a hose to the engine intake instead. Do they exist somewhere now ?
  10. Can anyone read chinese please ?

    Thank you, Markus. Perhaps 'end of charging has been reached - the charger can be disconnected now' As 'battery is fully charged' would imply the indicator could come on even while not connected to the charger or the receiver not even turned on, as long as the battery is fully charged. Just trying to read between lines... At least fully clears the doubt that is not related to tuning.
  11. Seawater electrolysis...

    Thank you. Let's see if I got something from it.... Electrolysis of seawater at say 2.5 Volts will deposit a mixture of all items under 2.51 V electrode potential onto the electrodes. If the seawater has depleted of those by a long enough process; electrodes replaced with new ones, and the process started again at 3.0 V; The group between 2.5V and 3.0V will be deposited onto the clean new electrodes ?
  12. Seawater electrolysis...

    Hi. Somewhere I read that electrolysis deposits collected on electrodes depend from the elements available in suspension and the voltage used. How was that ? Can someone explain or direct to a link to learn ? Does it mean that a 0.1Volt potential can deposit/separate perhaps one or a few elements; 0.5 V yields some additional more; 1V gets even more ? Where to find a table that relates voltage used for electrolysis and elements deposited ?
  13. Can anyone read chinese please ?

    It is an AM aviation band radio receiver : ----> https://www.aliexpress.com/item/110-140M-Digital-Display-Air-band-radio-receiver-Airband-Radio-Receiver-aviation-band-receiver-for-Airport/32840532855.html?spm=2114.search0104.3.123.94e6628fWvwTT6&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10130_318_10547_319_10546_5727220_317_10548_10545_10696_450_10084_10083_10618_452_535_534_533_10307_532_204_10059_10884_10887_100031_320_10103_448_449_5727320,searchweb201603_60,ppcSwitch_0&algo_expid=fea60d50-4ea0-4b14-8e9d-b2dba5567087-18&algo_pvid=fea60d50-4ea0-4b14-8e9d-b2dba5567087&priceBeautifyAB=0
  14. Unusual domain...

    Maaaany years ago, I encountered a sort of incomplete domain on the net. Today, I saw a similar situation of a domain (.co) behaving like a monopoly. What are they doing, why, is it legal ? Check this search results, multiple addresses or sites directing to same subscription request. ----> https://www.google.com/search?q=intek+v+twin+wiring+schematic&client=ubuntu&hs=MDq&channel=fs&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjQ_sfVloLeAhVQwlkKHbaHC-wQ_AUIDygC&biw=1366&bih=549 Choose images if not images; at least the different ".co" shown behave the same. What is going on ?
  15. A magnet fitted with long, straight, parallel pole pieces; will it have a constant field between them, near or distant from the magnet ? ================================================================== N magnet S ================================================================== A piece of iron placed at the middle of length or placed at the far right will attach with the same force ?