File Details
- Depositor
- Karen Dykes
- Date Uploaded
- 2021-12-08
- Date Modified
- 2021-12-08
- Fixity Check
- passed on August 08, 2024 at 14:06
- Characterization
-
Height: 1891
Width: 2375
File Format: tiff (Tagged Image File Format)
File Size: 13491864
Filename: pp_065.tif
Last Modified: 2025-05-06T02:52:24.453Z
Original Checksum: 6fc84a7b36eab1215c329cf4b7cb0ad4
Mime Type: image/tiff
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| Transcript |
- In the afternoon went out to the
department at Edinburgh + visited
Michael Swann + L.J. Hale.
The latter showed me a most
interesting closed circulation
saltwater system operating
12 - 20 gallon tanks + using
an air pump circulating system
passing 7 litres per minute.
His paper + diagrams are in my
library.
He also had an ingenious circulating
system for the study of growth
on hydroids under the microscope
it was a system using the
siphon principle and is diagrammed
on the next page. His time lapse
film is taken using a reversing
induction motor as the timer with
exposures every 20 -70 seconds
Hale has found that after a
period of life a hydranth may
be destroyed. The cells that
composed it appear in the coelom
+ are driven along it by peristaltic
contractions to lodge at the next
growing point.
[Drawing of circulating system for studying the growth of hydroids]
To sea water store for refilling
Screw clamp
To vacuum pump or tap for refilling
Siphon tube
Perspex cell for specimen
Glass tube
Hole
Very small hole
Other end of siphon tube
can be raised +
lowered to control
speed of flow.
Sea water store
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