04-14-03 11:10
No 426671
Raf discovered he has a brand new refractometer(or he thinks it is refractometer).It something like microscope but lot more buttons to turn and stuff.There are two mirrors attached to it and a tube i can look inside.When i turn a button i can see numbers running from 1.3 to 1.7 like 1.301 1.302 1.303 etc.I can also split one moving part that looks like a lens or something.Raf has never seen anything like that.Are refs easy to use?When i look inside of the tube,besides numbers there is another screen or somethign that goes darker/brighter as numbers change.I saw less than dozen thread on TFSE on refractometers,they don't seem to be popular over here...
For those about to synth,we salute you
(Hive Addict)
04-14-03 12:42
No 426682
general points:
first of all it's very important to have it temperated. for that you need
a thermostat, which you connect to the refractometer. (it surely has
two connections for that). refraction indices are highly temperature
dependant and are usually given for 20°C.
always keep the glass clean (eg with alcohol), take care not to
scratch it!
how to use:
* open the thing (the moving part you talk about), place a drop of your
substance on it and close it.
* look through the "tube". now turn the big knob and somewhere you should
see a sharp border between a bright and a dark region. adjust this
border to be exactly at the center.
* read the number. this is your refraction index.
* be amazed at how impure your product is
* open the thing and clean it with a tissue and some alcohol (bottom and top).
close it. done.
(Hive Addict)
04-14-03 21:19
No 426844
Does the light from the lamp have to fall on lens(which is splitable) under certain angle or is it not important
For those about to synth,we salute you
(Hive Addict)
04-14-03 23:34
No 426863
is the lamp attached to the refractometer?
if yes, then just bring it as close as possible to the lens,
after you have introduced your sample and closed it again.
(Hive Addict)
04-15-03 05:51
No 426943
No,there is no lamp but there is a mirror that you can use to reflect light to sample,actually there are 2 mirrors,other one is to illuminate number screen.I think i'll inspect this ref little more carefully...
For those about to synth,we salute you
(Hive Addict)
04-15-03 08:52
No 426979
Hmmm...wierd stuff that is.There are three windows on that moving part,that splits into 2,where you put that sample in,one in the cover and 2 in the in the lower part,one is closable with some cover.When lamp was pointed to one window i could see some light that went brighter as i turned the knob,other window was acting basibally same way,no sharp line between dark and bright,even when a sample of safrole was put onto dull sample screen on upper part of that splitable moving part.
For those about to synth,we salute you
(Hive Addict)
04-16-03 01:11
No 427201
could you please post a picture, in order to be sure
that we're talking about the same thing?
it's some time since i saw one of those, but iirc, the light
should enter through the opening with the flap. you need a
bright lamp, but afaik it needn't be polarised or monochromatic
or shit like that. just put the lamp as close as possible to
the opening.
concerning the sample: i don't know if i was clear enough,
but the sample is put on horizontal part, which is not on
the moving thing. using an eyedropper, you can smear the
drop a little bit, to get better spreading. after closing
the apparatus, there should be a knob, with which you can
fixate it (so that it is tightly closed). use it.
once it is closed, there is only one opening (the one with the
flap), isn't it?