Try the Wikipedia for a definition:   http://en.wikipedia.org/wiki/Newton Of 
course, John can answer too.

Best Wishes,
Jerry Payton
  ----- Original Message ----- 
  From: chief.cook.nz
  To: psn-l@..............
  Sent: Saturday, December 02, 2006 8:30 AM
  Subject: Re: Zero-length spring


  Hi John
  In this formula a NEWTON is what?  or how or why is called a NEWTON the 
rest
  I understand so a

  NEWTON:- =

  Cheers Tamati
  From the Castle of Tamati, Hinemoa and Karauwa the Dog
  From the Castle of Tom, Robyn and the Dog

  I'm Just a Stone's Throw Away:- NZ-021-150-33-59 or NZ-07-855-0195
                                Bush Telegragh:- chief.cook.nz@............
                         My Regular Pitstop:- Tamati
                                                                    P.O.BOX
  19-356 CENTRAL
                                                                    HAMILTON
                                                                    NEW
  ZEALAND
  ----- Original Message ----- 
  From: "John or Jan Lahr" 
  To: 
  Sent: Thursday, November 30, 2006 8:20 PM
  Subject: Re: Zero-length spring


  > At 10:29 PM 11/29/2006, you wrote:
  >>Hi John,  I am not too good at math, could you please plug-in some
  >>examples/numbers for this formula so I can understand it better? I think
  >>its k that I am unclear of.  I understand the rest. Thanks, Ted
  >>MgA = kSY/(SA)
  >>
  >>M = kY/(Ag)
  >
  > k is the spring constant.  In this example I'm using k = 2 newtons/cm
  >
  > M is the mass
  > Y is the height of the mast
  > A is the length of the boom
  > g is the acceleration of gravity
  >
  > The exact numbers don't really matter - the point being that the mass 
will
  > be stable at any angle of the boom.
  >
  > There are problems of trying to actually build this device, because 
slight
  > changes in k with temperature will cause instability.  Even without a
  > zero-length spring, one can extend the period by reducing the height of
  > the mast.  However, you will soon discover that this will also lead to
  > instability if pushed to too long a period.
  >
  > Cheers,
  > John
  >
  >
  >
  > __________________________________________________________
  >
  > Public Seismic Network Mailing List (PSN-L)
  >
  > To leave this list email PSN-L-REQUEST@.............. with the body of 
the
  > message (first line only): unsubscribe
  > See http://www.seismicnet.com/maillist.html for more information.

  __________________________________________________________

  Public Seismic Network Mailing List (PSN-L)

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Try the Wikipedia for a definition:   http://en.wikipedia.org/wiki=
/Newton Of=20
course, John can answer too.
 
Best Wishes,
Jerry Payton

  
----- Original Message ----- 
  From:=20
  chief.cook.nz 
  
To: psn-l@.............. 
  
Sent: Saturday, December 02, =
2006 8:30=20
  AM
  
Subject: Re: Zero-length =
spring
  

Hi John
In this formula a NEWTON is what?  or =
how or=20
  why is called a NEWTON the rest 
I understand so a

NEWTON:-=20
  =3D

Cheers Tamati
From the Castle of Tamati, Hinemoa and =
Karauwa the=20
  Dog
From the Castle of Tom, Robyn and the Dog

I'm Just a =
Stone's=20
  Throw Away:- NZ-021-150-33-59 or=20
  =
NZ-07-855-0195
         &=
nbsp;           &n=
bsp;       =20
  Bush Telegragh:- chief.cook.nz@............=

           &nb=
sp;          =20
  My Regular Pitstop:-=20
  =
Tamati
          &nb=
sp;           &nbs=
p;            =
;            =
            &=
nbsp;     =20
  P.O.BOX 
19-356=20
  =
CENTRAL
          &n=
bsp;           &nb=
sp;           &nbs=
p;            =
;            =
      =20
  =
HAMILTON
          &=
nbsp;           &n=
bsp;           &nb=
sp;           &nbs=
p;            =
;      =20
  NEW 
ZEALAND
----- Original Message ----- 
From: "John or Jan =
Lahr"=20
  <JohnJan@........>
To: <psn-l@..............>
Sent=
:=20
  Thursday, November 30, 2006 8:20 PM
Subject: Re: Zero-length=20
  spring


> At 10:29 PM 11/29/2006, you =
wrote:
>>Hi=20
  John,  I am not too good at math, could you please plug-in some=20
  
>>examples/numbers for this formula so I can understand it =
better? I=20
  think 
>>its k that I am unclear of.  I understand the =
rest.=20
  Thanks, Ted
>>MgA =3D kSY/(SA)
>>
>>M =3D=20
  kY/(Ag)
>
> k is the spring constant.  In this =
example I'm=20
  using k =3D 2 newtons/cm
>
> M is the mass
> Y is =
the height=20
  of the mast
> A is the length of the boom
> g is the =
acceleration=20
  of gravity
>
> The exact numbers don't really matter - the =
point=20
  being that the mass will 
> be stable at any angle of the=20
  boom.
>
> There are problems of trying to actually build =
this=20
  device, because slight 
> changes in k with temperature will =
cause=20
  instability.  Even without a 
> zero-length spring, one can =
extend=20
  the period by reducing the height of
> the mast.  However, =
you will=20
  soon discover that this will also lead to 
> instability if =
pushed to=20
  too long a period.
>
> Cheers,
>=20
  John
>
>
>
>=20
  =
__________________________________________________________
>
>=
;=20
  Public Seismic Network Mailing List (PSN-L)
>
> To leave =
this list=20
  email PSN-L-REQUEST@...............
=20
  with the body of the 
> message (first line only): =
unsubscribe
>=20
  See http://www.seismicnet.co=
m/maillist.html=20
  for more information.=20
  =


__________________________________________________________
Public=20
  Seismic Network Mailing List (PSN-L)

To leave this list email =
PSN-L-REQUEST@...............
=20
  with 
the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.co=
m/maillist.html=20
  for more information.