Antheraea yamamai -from silk to Mach number

PICT0300

It is a hot August whether these days here around, the temperatures above 30 degrees C for almost two weeks.Only nights are a bit cooler,we stay awake quiet late. Yesterday evening was the same,we were watching TV as a strange visitor came in-a yellow, huge moth was flying across the room almost like a bird,then he sat down on a plant and remained there long enough for us to make some pics. We’ve seen such a big moth here for the first time-and have been very impressed by his story.

Yamamai or Japanese Oak Silkmoth has been cultivated in Japan for more than 1000 years,its silk is white,elastic,durable and very expensive.Adult moth has a wingspan of 10-15cm.Its larvae feed on quercus while the adult moth doesn’t eat at all,he has enough energy to fly for a couple of days and to reproduce,then he dies.In the middle of 19-th century family Mach has settled in Veliki Slatnik (Slovenia).In 1866 Johann Mach imported yamamai eggs to start with the production of Shantung silk .The business didn’t succeed ,but the yamamai butterflies succeeded to survive in new habitat ,even more, from Veliki Slatnik they spread to whole Balkan, Italy,Austria,they have been spotted in Germany. Johann Mach and his wife are buried for a long time.Their grave at the cemetery of Veliki Slatnik is almost forgotten. Yet whenever yellow yamamai   appears here around, he brings with him a story of family  coming from far to live in these rural area,with a strange idea of producing silk and leaving this beautiful moth to fly further to Europe.And there is still another story yamamai brings with him, a story of Mach son ,loving the land around fathers farm that much that he was returning back home for his holidays.Professor of physic at the universities of Graz,Prague,Vienna wrote some of hist best works at the farm where his father explored the conditions to suit  yamamai silk production best.And who this son was? Ernst Mach, great physic and philosopher of time,Mach number is just one of his many contributions.So  from now on when I will see a yamamai I will remember Veliki Slatnik, silk and Mach number……..

Ernst Mach (German pronunciation: [ˈɛɐnst ˈmax]) (February 18, 1838 – February 19, 1916) was an Austrian physicist and philosopher, noted for his contributions to physics such as the Mach number and the study of shock waves. As a philosopher of science, he was a major influence on logical positivism and through his criticism of Newton, a forerunner of Einstein‘s relativity.from:http://en.wikipedia.org/wiki/Ernst_Mach

In fluid mechanicsMach number (\mathrm{Ma} or M) (generally play /ˈmɑːk/, sometimes /ˈmɑːx/ or /ˈmæk/) is a dimensionless quantity representing the speed of an object moving through air or other fluid divided by the local speed of sound.[1][2] It is commonly used to represent the speed of an object when it is traveling close to or above the speed of sound.from:http://en.wikipedia.org/wiki/Mach_number

Antheraea yamamai
Living adult
Antheraea yamamai superba
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Saturniidae
Tribe: Saturniini
Genus: Antheraea
Species: A. yamamai
Binomial name
Antheraea yamamai
Guérin-Méneville, 1861[verification needed]
Synonyms

Antheraea yamamai -from silk to Mach number

It is a hot August whether these days here around, the temperatures above 30 degrees C for almost two weeks.Only nights are a bit cooler,we stay awake quiet late. Yesterday evening was the same,we were watching TV as a strange visitor came in-a yellow, huge moth was flying across the room almost like a bird,then he sat down on a plant and remained there long enough for us to make some pics.We’ve seen such a big moth here for the first time-and have been very impressed by his story.

Yamamai or Japanese Oak Silkmoth has been cultivated in Japan for more than 1000 years,its silk is white,elastic,durable and very expensive.Adult moth has a wingspan of 10-15cm.Its larvae feed on quercus while the adult moth doesn’t eat at all,he has enough energy to fly for a couple of days and to reproduce,then he dies.In the middle of 19-th century family Mach has settled in Veliki Slatnik (Slovenia).In 1866 Johann Mach imported yamamai eggs to start with the production of Shantung silk .The business didn’t succeed ,but the yamamai butterflies succeeded to survive in new habitat ,even more, from Veliki Slatnik they spread to whole Balkan, Italy,Austria,they have been spotted in Germany. Johann Mach and his wife are buried for a long time.Their grave at the cemetery of Veliki Slatnik is almost forgotten. Yet whenever yellow yamamai   appears here around, he brings with him a story of family  coming from far to live in these rural area,with a strange idea of producing silk and leaving this beautiful moth to fly further to Europe.And there is still another story yamamai brings with him, a story of Mach son ,loving the land around fathers farm that much that he was returning back home for his holidays.Professor of physic at the universities of Graz,Prague,Vienna wrote some of hist best works at the farm where his father explored the conditions to suit  yamamai silk production best.And who this son was? Ernst Mach, great physic and philosopher of time,Mach number is just one of his many contributions.So  from now on when I will see a yamamai I will remember Veliki Slatnik, silk and Mach number……..

Ernst Mach (German pronunciation: [ˈɛɐnst ˈmax]) (February 18, 1838 – February 19, 1916) was an Austrian physicist and philosopher, noted for his contributions to physics such as the Mach number and the study of shock waves. As a philosopher of science, he was a major influence on logical positivism and through his criticism of Newton, a forerunner of Einstein‘s relativity.from:http://en.wikipedia.org/wiki/Ernst_Mach

In fluid mechanicsMach number (\mathrm{Ma} or M) (generally play /ˈmɑːk/, sometimes /ˈmɑːx/ or /ˈmæk/) is a dimensionless quantity representing the speed of an object moving through air or other fluid divided by the local speed of sound.[1][2] It is commonly used to represent the speed of an object when it is traveling close to or above the speed of sound.from:http://en.wikipedia.org/wiki/Mach_number

Antheraea yamamai
Living adult
Antheraea yamamai superba
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Saturniidae
Tribe: Saturniini
Genus: Antheraea
Species: A. yamamai
Binomial name
Antheraea yamamai
Guérin-Méneville, 1861[verification needed]
Synonyms

Triticum aestivum , straw hat and Sorolla

image

Searching a photo for the end of summer holidays post this butterfly taking a rest on my straw hat was the one I liked at once.My first thought was to write how summer holidays always end  even before a butterfly opens its wings,and how the butterfly effect on the other side bears some possibility that also a too short vacation could change our perspectives in the future.Then I noticed the nice structure of my straw hat and wandered what it is made from, recognizing this post ca not be only about ending summer holidays, butterfly effect or my dear hat, but mostly about common wheat and Sorolla.  

from:http://www.domzale.si/index.php?S=1&Article=4442

Near the place I live is Domzale-today almost a suburb of Ljubljana,but not so far ago a center for production of straw hats.It all has begun in the first half of 18-th century, when country women have started with straw plaiting as it has been a good possibility to earn some extra money during winter months. During wheat harvest the proper wheat plants were chosen and picked manually, then sorted (the tiniest straw was more expensive) and prepared for plaiting.  In 1879 there were 12000 people (half of the population) involved in production of straw hats,in 1880 the production was estimated to be 1 million hats ,made in 6 hat factories in Domzale. These straw hats  were exported all around the world,it could be that even the ladies from the picture of the Spanish painter Sorolla do wear those hats,very modern at the time.This picture is one of my favorites,not only as I love straw hats and white dresses and the sea,but mainly for this feeling of summer Sorolla managed to catch so well…….

PASEO A ORILLAS DEL MAR, 1909

PASEO A ORILLAS DEL MAR,1909, from:http://museosorolla.mcu.es/colec_pintura.html

Sorolla was certainly a master of summer light,his paintings of his garden make you feel like it is possible to step further, right into the garden shade……………

JARDÍN DE LA CASA SOROLLA, 1920

JARDÍN DE LA CASA SOROLLA, 1920,from:http://museosorolla.mcu.es/colec_pintura.html

JARDÍN DE LA CASA SOROLLA, 1918-1919

JARDÍN DE LA CASA SOROLLA,1918-1919, from:http://museosorolla.mcu.es/colec_pintura.html

Being in garden once again,here comes the picture of common wheat used (also) for straw hat the butterfly on my pic was sitting on…………

Line Drawing of Triticum aestivum L.

from:USDA-NRCS PLANTS Database / Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Miscellaneous Publication No. 200. Washington, DC.

Classification:
Triticum aestivum L.

Click on a scientific name below to expand it in the PLANTS Classification Report.

Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Liliopsida – Monocotyledons
Subclass Commelinidae
Order Cyperales
Family Poaceae – Grass family
Genus Triticum L. – wheat
Species Triticum aestivum L. – common wheat

from:USDA, NRCS. 2012. The PLANTS Database (http://plants.usda.gov, 4 August 2012). National Plant Data Team, Greensboro, NC 27401-4901 USA.