10-24-2012, 03:53 AM
Relevant english literature:
P.H. Blyth, A.G. Atkins, Stabbing of metal sheets by a triangular knife. An archaeological investigation, in: International Journal of Impact Engineering 27 (2002) 459-473.
http://www.deepdyve.com/lp/elsevier/stab...hZDGtJzN2A
P.H. Blyth, 1988. "Cold-working in Ancient Greek Helmets, in: Aspects of Ancient Mining and Metallurgy: Ada of a British School at Athens Centenary Conference at Bangor, (1988) 151-154.
Blyth, P.H., Metallurgy of Two Fragmentary Archaic Greek Helmets, J. Hist. Met. Soc. 27 (1993) 25–36.
P.H. Blyth, Metallurgy of bronze armour. Use of work hardening in the Late Corinthian helmet as evidence of mastery of material, in: Praktika tou XII Diethnous Synedriou Klasikis Archaiologias (Athens 1988) 293-296.
About the development of Corinthian helmets towards thinness:
P. H. Blyth, The Effectiveness of Greek Armour against arrows in the Persian War. (490-479 BC), Diss. University of Reading 1977.
Measurements of original helmets and helmet parts from Olympia have shown following Brinell-hardness:
Early Corinthians:
70-100 HB
Middle and Late Corinthians:
140-200 HB
So I find it extremely difficult to see the " sponginess" you talk about.
Compare here:
http://en.wikipedia.org/wiki/Brinell_hardness_test
These for bronze extremely hard original helmets, on which one can discern all kinds of different tool marks which enable experts to investigate the whole production process are very light and thin in comparison to your model. Is it possible that you did cast the whole helmet in one piece and then worked it over? If so, your production technique would be very different from the original production technique, which apart from casting a raw rudimentary form mostly involved a large amount of driving with different types of hammers and anvils, as can also be seen on vase paintings.
As for the specific weight of bronze: Of course you are correct about that, it is around 8,8, whereas e.g. steel is around 7,9. Lead is around 13, for comparison. So the difference between bronze and steel e.g. is not that much...
The volume of a helmet would then tell us what it would have weighed. With the thinness of the material of the originals, however, I think it is impossible to reach weights as you suggest.
P.H. Blyth, A.G. Atkins, Stabbing of metal sheets by a triangular knife. An archaeological investigation, in: International Journal of Impact Engineering 27 (2002) 459-473.
http://www.deepdyve.com/lp/elsevier/stab...hZDGtJzN2A
P.H. Blyth, 1988. "Cold-working in Ancient Greek Helmets, in: Aspects of Ancient Mining and Metallurgy: Ada of a British School at Athens Centenary Conference at Bangor, (1988) 151-154.
Blyth, P.H., Metallurgy of Two Fragmentary Archaic Greek Helmets, J. Hist. Met. Soc. 27 (1993) 25–36.
P.H. Blyth, Metallurgy of bronze armour. Use of work hardening in the Late Corinthian helmet as evidence of mastery of material, in: Praktika tou XII Diethnous Synedriou Klasikis Archaiologias (Athens 1988) 293-296.
About the development of Corinthian helmets towards thinness:
P. H. Blyth, The Effectiveness of Greek Armour against arrows in the Persian War. (490-479 BC), Diss. University of Reading 1977.
Measurements of original helmets and helmet parts from Olympia have shown following Brinell-hardness:
Early Corinthians:
70-100 HB
Middle and Late Corinthians:
140-200 HB
So I find it extremely difficult to see the " sponginess" you talk about.
Compare here:
http://en.wikipedia.org/wiki/Brinell_hardness_test
These for bronze extremely hard original helmets, on which one can discern all kinds of different tool marks which enable experts to investigate the whole production process are very light and thin in comparison to your model. Is it possible that you did cast the whole helmet in one piece and then worked it over? If so, your production technique would be very different from the original production technique, which apart from casting a raw rudimentary form mostly involved a large amount of driving with different types of hammers and anvils, as can also be seen on vase paintings.
As for the specific weight of bronze: Of course you are correct about that, it is around 8,8, whereas e.g. steel is around 7,9. Lead is around 13, for comparison. So the difference between bronze and steel e.g. is not that much...
The volume of a helmet would then tell us what it would have weighed. With the thinness of the material of the originals, however, I think it is impossible to reach weights as you suggest.
Christian K.
No reconstruendum => No reconstruction.
Ut desint vires, tamen est laudanda voluntas.
No reconstruendum => No reconstruction.
Ut desint vires, tamen est laudanda voluntas.
