In a message dated 26/09/05, asc@............... writes:

> Chris
> No need to spray the back. Just use hair spray for oily hair - it contains 
> no  oil particles which cause the blotchy look and can obscure the first 
> arrival.

Hi Kevin,

       Thanks for the comment! The blotchy look on my early gliding barograph 
traces came from actual blast / droplet removal of areas of carbon. The 
coating is only lightly attached and the adhesion can be somewhat variable. Sure, 
with practice I learnt to lightly smoke the paper just the right amount and 
later spray the coat from a considerable distance to fix it to get a nice clear 
trace, but this took quite a bit of trial and oops. 
       I later found it much easier to spray / soak just the back of the 
paper and get a 100% reliable good trace - there is no skill to learn and it uses 
less hair spray! You can also use other types of spray lacquer. The paper also 
becomes more translucent making the trace easier to read. Why do things the 
hard way?

       Regards,

       Chris Chapman
In a message=20=
dated 26/09/05, asc@............... writes:



Chris

No need to spray the back. Just use hair spray for oily hair - it contai=
ns no  oil particles which cause the blotchy look and can obscure the f=
irst arrival.




Hi Kevin,



       Thanks for the comment! The blotchy=
 look on my early gliding barograph traces came from actual blast / droplet=20=
removal of areas of carbon. The coating is only lightly attached and the adh=
esion can be somewhat variable. Sure, with practice I learnt to lightly smok=
e the paper just the right amount and later spray the coat from a considerab=
le distance to fix it to get a nice clear trace, but this took quite a bit o=
f trial and oops.=20

       I later found it much easier to spr=
ay / soak just the back of the paper and get a 100% reliable good trace - th=
ere is no skill to learn and it uses less hair spray! You can also use other=
 types of spray lacquer. The paper also becomes more translucent making the=20=
trace easier to read. Why do things the hard way?



       Regards,



       Chris Chapman