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About Externet

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  • Location
    Mideast U.S.
  • Interests
    Old Cadillacs, scuba electronics.
  • 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.

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  1. What determines viability in grafting a tree, like a cherry branch into a peach trunk. Do the classification taxonomy terms tell what is compatible ?, clade, order, family, genus, species... Also, Is it possible to graft a branch of a male say pistachio tree onto a female pistachio trunk and obtain a self pollinating (by proximity) tree species ?
  2. Can any religion fanatic explain what is seen as good to call 'good friday' the day commemorating the killing of the skinny guy on a cross ?
  3. Thank you sir, +1 What is "improve" ? Makes it less or more diverging?
  4. Thank you. The failed embedded image was just a generic one like : What if possible could be the way to obtain one Km long 10cm diametre fat beam as close as possible from start to end ? These are outdoors ---> https://www.youtube.com/watch?v=RmcQNiNHemc - ---> https://www.youtube.com/watch?v=uYKERtq_L5M
  5. Seems that if a laser beam is bigger than about 2 mm diametre it is not a laser any more ? Or is it still a laser even if the beam is 1 metre diametre ? How is that accomplished ? Diverging lens and collimator after ? The danger of vision impairment persists or is it greatly reduced as the light 'density' is a much smaller figure ? Which wavelength shows the beam brighter at night ? To achieve 1Km range on a 10cm fat beam at night, what power would be needed by educated guess ?
  6. Hi. Can you instead of comparing the cost$ for time lapses, tell/compare KWh of consumption for the lapses ? My local energy is supplied typically by gas and/or electric. Eliminated the gas years ago and am using electric heat only, because the gas company wanted to charge a monthly minimum even for zero consumption to 'maintain' the account during ~8 not-cold months of the year. So kicked them out in 2016, not willing to 'maintain' their pockets besides peace of mind with no gas in the dwelling. Make sure you are not in that kind of trap, or utilities 'policy' changes. (
  7. I would explore routing/passing the water mains into a radiator inlet inside your apartment and returning its outlet to the building supply. You would be extracting only its coolness. Enclosing the radiator would limit how much cold you get. Adding a fan trough the radiator would increase the cooling. Main water into building >---------------------------------------A cut B---------------------------------->building supply Insert a radiator inside your apartment between A and B; and wear a jacket. A window air conditioner is an alternative that can cool the who
  8. Remember dealing with the Réaumur scale in high school, the equivalent formula was dividing by 4. But was never taught about Rankine.
  9. And maaaany more oddities in USA as the ounces, feet, inches, gallons, pounds, furlongs, fathoms, knots, MMDDYY, small, medium and large; twin, queen, full, king , AM/PM, acres... They just missed to drive on the left lane 😊
  10. Welcome. What is the temperature of the water mains supply in summer; and the temperature of any ground source water well available to tap in the vicinity ? Are you allowed to install a 'window' air conditioner ? Are you allowed to glue styrofoam on your room interior surfaces ? This has to be near 100 euros
  11. Thanks. Now am done scratching my head... If Betelgeuse explodes tomorrow, its 'little bang' will spit matter expanding in all directions away from wherever in the Orion constellation it is today. That will be its point from where it expands. How does the "All points" refer to it if you are observing it from planet earth or observing it from Antares at Scorpius ?
  12. Hi. Where in the universe is the point all galaxies, planets, celestial bodies are moving away from in their expansive motion ? Is that point consistently the one and only same for all constellations ? Is there any curving/bent trajectory ? Am sorry for the poor wording.
  13. Hi. These are double pane windows from 1990 in excellent condition for their age. Their poor design conducts the frame cold from the outside to inside. Adding a 'storm' window would be on the exterior as far as i know; not preventing much of the outside cold to reach the frame. If investing on them would give a cure am not against the cost. What am against is investing for no improvement. I have laid a towel strip on the sill and collects the running moisture and improves the problem with the towel treated with bleach, ammonia, vinegar... The nature of the towel wicks and evapor
  14. Thanks gentlemen. I did try single sided adhesive 3mm foam on the inside window frame as insulation coat, not that brand; did not stay stuck to the aluminium 😤 Keeping the area dry is much easier typed than done. A dozen windows of ~2mx1m in half a dozen rooms... A brand of bleach left crystals after spraying dried and prevented the mold for a lot longer, but not the condensation 😞
  15. Greetings. Aluminium windows of goofy design transmit/conduct the sub-freezing exterior to the frame interior causing condensation and mold. Applying chlorine bleach kills the mold instantly; but would like opinions on a powder/solid 'chalk'/drying film spray applicable to the frame to prevent long term the mold from forming.
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