I used the centrifuge to concentrate down material from “open water” in the pot pond (i.e. not near edge or bottom or plants) and views the result in the LOMO Polam P-113 microscope, by bright field & crossed polarisation.
Note that such open water samples do not contain diatoms – which are famously birefringent.
Birefringement material pot pond slide 280518@1642, x20 objective:
Birefringent material slide from pot pond 280518@1703, x20 objective:
Insect on slide pot pond water 280518@1626 panorama, x20 objective:
Slide from pot pond: birefringent material shown in sequence as I moved the second polarised filter from 0-90 degrees so that the sample moved between crossed polarisation and bright field, 280518@1639 (below):
Slide from pot pond highly birefringent organisms brightfield x20 obj 280518@1635: