Unfortunately, there is an obstacle to reading this article: "Unfortunately 
you do not have a license to view this article in IOPscience.  You can 
access 1961 J. Sci. Instrum. 38 37 through our Electronic Journals service." 
This is true of so many scientific articles found on the web.  Alas, no mon, 
no fun.
Regards,
Jerry


----- Original Message ----- 
From: Randall Peters
To: psn-l@..............
Sent: Tuesday, February 26, 2008 6:54 AM
Subject: wonderful invention of R. V. Jones


With the attention so frequently given to optical-type detectors, I am 
surprised that nobody
has yet (to my knowledge) mentioned what I believe to be the most clever 
invention of them
all.
The great R. V. Jones, who is best known and quoted in seismology for his 
work with
capacitive sensors, while at Aberdeen invented a modified optical lever that 
uses Ronchi
rulings.  Ronchi is in this modern era largely unknown, but his 
contributions in the field of
figure-testing of optical components was of truly great significance.  Those 
who want to
study Jones' system can download the following paper:
http://iopscience.iop.org/0950-7671/38/2/301/pdf
What is most remarkable about the coarse gratings (Ronchi rulings) used for 
this work is that
they work with ordinary (non-monochromatic) light from an incandescent bulb. 
I have for
about two decades demonstrated to students the physics of this remakable 
system by means of a
spherical mirror in which the white light bulb/grating combination is 
situated at the center
of curvature.
    To those who are impressed by observing displacements as small as a 
nanometer, consider
the following:  In the 1960 paper referenced above, Jones claims a 
resolution of 0.1 nrad!
It should be noted that this device is not a simple (standard) optical lever 
where one
typically is limited to tenths of a microradian;  Jones combined Ronchi 
rulings with the
optical lever to produce a whole new concept--much better for seismic 
purposes, if anybody
wants to try it.  In my case--so much of interest, limited time left to 
pursue them!








Unfortunately, there is an obstacle to reading this article:=20
"Unfortunately you do not have a license to view this article in=20
IOPscience.  You can access 1961 J. =
Sci.=20
Instrum. 38 37 through our Electronic Journals=20
service."  This is true of so many scientific articles found =
on the=20
web.  Alas, no mon, no fun.
Regards,
Jerry
 
 
----- Original Message -----=20
From: Randall Peters=20

To: psn-l@.............. 
Sent: Tuesday, February 26, 2008 6:54 AM
Subject: wonderful invention of R. V. Jones

With the attention so frequently given to optical-type =
detectors,=20
I am surprised that nobody
has yet (to my knowledge) mentioned what I =
believe=20
to be the most clever invention of them
all.
The great R. V. =
Jones, who is=20
best known and quoted in seismology for his work with
capacitive =
sensors,=20
while at Aberdeen invented a modified optical lever that uses=20
Ronchi
rulings.  Ronchi is in this modern era largely unknown, =
but his=20
contributions in the field of
figure-testing of optical components =
was of=20
truly great significance.  Those who want to
study Jones' system =
can=20
download the following paper:
http://iopscien=
ce.iop.org/0950-7671/38/2/301/pdf
What=20
is most remarkable about the coarse gratings (Ronchi rulings) used for =
this work=20
is that
they work with ordinary (non-monochromatic) light from an=20
incandescent bulb.  I have for
about two decades demonstrated to =

students the physics of this remakable system by means of a
spherical =
mirror=20
in which the white light bulb/grating combination is situated at the=20
center
of curvature.
    To those who are impressed =
by=20
observing displacements as small as a nanometer, consider
the=20
following:  In the 1960 paper referenced above, Jones claims a =
resolution=20
of 0.1 nrad!
It should be noted that this device is not a simple =
(standard)=20
optical lever where one
typically is limited to tenths of a=20
microradian;  Jones combined Ronchi rulings with the
optical =
lever to=20
produce a whole new concept--much better for seismic purposes, if=20
anybody
wants to try it.  In my case--so much of interest, =
limited time=20
left to pursue them!