From: nze christian (christian_nze@hotmail.com)
Date: 02/07/01-12:38:42 PM Z
Hi
In lab we admit that a drop is equal to 0.05 ml
so 10 drops = 0.5ml
it is approximative but it isn't far from reality.
Nze christian
>From: Nick Makris <nick@mcn.org>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: pipette dreams
>Date: Wed, 07 Feb 2001 10:23:13 -0800
>
>Jeffrey, Great idea. Question - do you have the relationship of drops to
>millileters or stated differently, how do you determine the correct amount
>of fluid to be dispensed.
>
>Everyone starts with drops and one could use a known dropper as the
>calibrated measure. It could be that the best way to determine where to
>make the mark on the dropper would be to take the dropper that you use
>successfully and drop drops into the 'to be marked' dropper. Just a
>thought.
>
>Nick
>
>----- Original Message -----
>From: "Jeffrey D. Mathias" <jeffrey.d.mathias@worldnet.att.net>
>To: "alt-photo-process list" <alt-photo-process-l@usask.ca>
>
>
> > Here's a way to turn an inexpensive dropper into an accurate pipette for
> > measuring out coating solutions.
> >
> > This works best for glass droppers and may be more accurate than using
> > plastic.
> >
> > Materials:
> > + droppers
> > + a small calibrated syringe (1 ml, accurate to .01 ml, most drug stores
> > have these)
> > + masking tape
> > + chemical resistant white epoxy paint
> > + distilled water
> >
> > Instructions to calibrate:
> > + determine the amount required to be dispensed
> > + fill syringe to desired amount with distilled water (distilled is used
> > so as not to contaminate the dropper.)
> > + remove bulb from dropper
> > + placing finger over narrow end of dropper and holding with large end
> > up, fill with measured syringe contents
> > + place masking tape on dropper so that edge is at the level of the
> > water and the tape covers the water filled portion.
> > + release water from dropper
> > + mark a line on the dropper at the tape edge using the epoxy paint
> > + remove tape and let paint dry
> >
> > Instructions to Use:
> > + fill dropper with solution to just above paint line
> > + then empty some solution back so that the top of the solution is at
> > the top of the paint line
> > + empty entire dropper into destination
> >
> > The delivery might be slightly less due to solution sticking to the
> > dropper surface, but should be very consistent.
> >
> > Each dropper has been marked to deliver the precise desired amount of
> > solution. A dropper could even have several marks.
> >
> > --
> > Jeffrey D. Mathias
> > http://home.att.net/~jeffrey.d.mathias/
> >
>
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