From: "Dave Cushman" <dave.cushman@lineone.net>
Date: Mon, 1 Oct 2001 17:01:08 +0100
To: <BiologicalBeekeeping@yahoogroups.com>
Subject: Re: Wing Veins & Bee analyses'

Hi Pav & all

> >but "V"s with a subtended
> >angle of 152 degrees could be arranged
> >so that 30 of them (the values 1.00
> >to 4.00) would go on one 35 mm slide.

The two veins that are used to establish CI are at a fixed angle of 152
degrees. This is why a Herold fan is such an easy tool to use.

Life sized "V"s are out as a registration error as small as 0.025 mm
(0.001") would encompass about 25% of the Apis bees in the world.

The x10 magnification cuts down the error by 100 fold and the wall
projection method reduces the error by a factor of 10,000.

Even with this refinement there are still subjective elements like the
judgement of the centre of a wing vein joint.

Discoidal shift assesment is done with a different tool, but the same
problems with smallness of natural wing size apply.

Harvey's slide idea is the way it is done in UK.

Best regards & 73s... Dave Cushman G8MZY