Microscope arrow revisited

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From:Laurence Reilly <laurie.reilly@jcu.edu.au>
To:Ms Louise Taylor <179LOU@chiron.wits.ac.za>
Date:Fri, 24 Sep 1999 16:52:38 +1000
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Dear Loiuse and other interested microscopists,
We took your suggestion to think laterally and place an arrow on each of
the monitors in our video system, and it works very well.

The arrows were cut from "Dymo" tape and one arrow placed just off centre
on one monitor. A slide was placed on the microscope and a high power image
was projected onto the screens (4). Then one recognisable cell nucleus was
lined up on the arrow. The other arrows were then stuck to the other
monitors so that the points of the arrows lined up on the same nucleus. Now
we can move the slide on the microscope and use the tips of the arrows as a
datum point to demonstrate features in histo slides.

The only disadvantage we have found is that there is a slight parallax
error because of the thickness of the screen, so that at high power (X40)
the arrow loses some accuracy. The arrows have been in place for three
months now, and for most of our applications teaching normal histology the
arrows work very well. 

Thank you Louise for a cheap and practical solution to an otherwise very
expensive problem.

Regards,  Laurie.

Mr.Laurie Reilly                          Ph 07 4781 4468
Physiology & Pharmacology                 Fax  07 4781 5558 
Aust.Inst.of Tropical Vet.& Animal Sc.    
James Cook University                     laurie.reilly@jcu.edu.au
       Townsville  Qld. 4811                            

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