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 These photos were taken with a foldscope on a small dirt sample taken outside on Princeton University’s campus. This location was in the middle of a small clearing, about 10m away from a road.  The bubbles are due to incomplete compression of the two stickers coming together, but as you can see, aside from dirt clumps, there is also a clear root with some dirt coming off of it. This was a damp, rich dirt, thus creating a homogenous fine powder over the slide was difficult and resulted in the clumps of material seen below.
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 <img alt="IMG_1898" class="alignnone size-medium wp-image-91908 gcloudimg" data-attachment-id="91908" data-comments-opened="1" data-image-meta='{"aperture":"2.2","credit":"","camera":"iPhone 6","caption":"","created_timestamp":"1543932192","copyright":"","focal_length":"4.15","iso":"64","shutter_speed":"0.033333333333333","title":"","orientation":"6"}' data-image-title="IMG_1898" data-recalc-dims="1" height="225" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_91894/IMG_1898.jpg" width="300"/>
 <img alt="IMG_1899" class="alignnone size-medium wp-image-91909 gcloudimg" data-attachment-id="91909" data-comments-opened="1" data-image-meta='{"aperture":"2.2","credit":"","camera":"iPhone 6","caption":"","created_timestamp":"1543932194","copyright":"","focal_length":"4.15","iso":"64","shutter_speed":"0.033333333333333","title":"","orientation":"6"}' data-image-title="IMG_1899" data-recalc-dims="1" height="225" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_91894/IMG_1899.jpg" width="300"/>
 <img alt="IMG_1902" class="alignnone size-medium wp-image-91911 gcloudimg" data-attachment-id="91911" data-comments-opened="1" data-image-meta='{"aperture":"2.2","credit":"","camera":"iPhone 6","caption":"","created_timestamp":"1543932202","copyright":"","focal_length":"4.15","iso":"80","shutter_speed":"0.033333333333333","title":"","orientation":"6"}' data-image-title="IMG_1902" data-recalc-dims="1" height="225" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_91894/IMG_1902.jpg" width="300"/>
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Princeton EEB 321 Foldscope

Kimberly Peterson

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