ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] In each pebble, a hole in. deep and 1/8 in. diameter was made. It was found that local flint from the beach was very difficult to drill, and a compromise had to be made by using pebbles of Permian Sandstone, with a few flints only, and also a number of pebbles made of cement. The pebbles averaged ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/178257a0
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