XPost: rec.arts.comics.strips   
   From: wthyde1953@gmail.com   
      
   Cryptoengineer wrote:   
   > On 10/16/2025 4:03 PM, William Hyde wrote:   
   >> Cryptoengineer wrote:   
   >>> On 10/15/2025 4:30 PM, William Hyde wrote:   
   >>>> Mark Jackson wrote:   
   >>>>> On 10/15/2025 10:34 AM, Scott Dorsey wrote:   
   >>>>>> Scott Dorsey  wrote:   
   >>>>>>> Paul S Person   wrote:   
   >>>>>>>> IIRC, at some point Galileo was in charge of the Pisan   
   >>>>>>>> artillery.   
   >>>>>>>>   
   >>>>>>>> I wonder if he was trying to find out why their "time on target"   
   >>>>>>>> computations [1] never worked with Aristotle's view of how   
   >>>>>>>> things fell.   
   >>>>>>>   
   >>>>>>> _Two New Sciences_ has a discussion of this and is well worth   
   >>>>>>> reading.  Note that Galileo is thinking throughout of bodies   
   >>>>>>> attracted to the earth and never makes that great jump of   
   >>>>>>> Newton's.   
   >>>>>>   
   >>>>>> I take that back.  I thought there was a discussion of time of   
   >>>>>> flight but looking it up I find there is not.... it would be   
   >>>>>> difficult to do without the calculus I suspect.   
   >>>>>   
   >>>>> Probably not.  Did they know the muzzle velocity of the devices to   
   >>>>> which a given distance/angle table applies?  Then, assuming no   
   >>>>> meaningful impact of air resistance:   
   >>>>>   
   >>>>> time-to-target = distance divided by (muzzle velocity)*cos(angle).   
   >>>>>   
   >>>> I seem to recall from Aubrey that one of Elizabeth's scholars   
   >>>> applied mathematics to gunnery, possibly Dr Dee before he became an   
   >>>> occultist.   
   >>>>   
   >>>> The Parliamentary officer Nathaniel Nye directed cannon in the   
   >>>> English civil war and published a book on the mathematics of it in   
   >>>> 1647, in which he cited a much earlier Italian mathematician,   
   >>>> Tartaliga, who wrote on the subject in 1537.   
   >>>>   
   >>>> William Hyde   
   >>>   
   >>> "Time on target" involves firing several projectiles, setting the   
   >>> propellent charges, firing times, and elevation of the cannon(s)   
   >>> to cause the shells to arrive at the target simultaneously.   
   >>>   
   >>> I've seen this done using cannon that have liquid propellants   
   >>> and computer control. I can't imagine it being done with fixed   
   >>> charges, or without computers, save as the result of a careful   
   >>> iterative set of firings to zero on on the charges, timing and   
   >>> elevations needed.   
   >>>   
   >>> Please remember that Aubrey makes sh*t up.   
   >>   
   >> Well, he didn't have much of a BS detector, and never met a good story   
   >> he didn't spread, but I wasn't aware that he consciously lied.   
   >   
   > I seen articles where his colorful 'British naval jargon' is shown to   
   > lack any contemporary examples.   
      
   Ah, we're talking about different Aubreys.   
      
   I should have been clearer.  I found this reference in John Aubrey's   
   "Brief Lives". Sorry about that.   
      
   And any such person would have been at least a generation after Tartaliga.   
      
   William Hyde   
      
   --- SoupGate-Win32 v1.05   
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