Saturday, November 25, 2017

Grandma Ruth's Limpa Rye Bread



Grandma Ruth's Limpa Rye

Makes one large loaf

Preheat oven to 375 F if using loaf pan or 450 F if using dutch oven an hour before baking the bread.

Ingredients

1 Tablespoon instant yeast
1 Tablespoon plus 1 teaspoon Molasses
1/2 cup of water
Juice and zest of one orange
1 tablespoon shortening
1 tablespoon white sugar
1 tablespoon brown sugar
1 & 1/2 teaspoons salt
3/4 cups plus 2 tablespoons Butter Milk
1/4 teaspoon soda
1 pound 454 grams Rye flour
Between 3/4 cup and a cup of white flour ( Either all purpose or bread flour) as needed to add during the kneading process


Add molasses, water, orange juice, orange zest, sugar ,shortening and salt to a sauce pan and bring to a boil then allow to cool until tepid. Add buttermilk and soda to the liquid ingredients.

Put Rye flour and yeast in a stand mixer with dough hook or a large bowl if you are hand kneading. Knead for 5 minutes adding white flour gradually until the dough forms a mass and comes away from the bowl. Put the finished dough in a covered bowl at room temperature and allow to rise until double in bulk, at least 1.5 hours and up to 3 hours. Deflate the dough cover again and allow to almost double in bulk a second time around 1.5 hours. Deflate the dough again and shape into a loaf for your pan or a round if using the dutch oven method. Cover with a tea towel and allow to rise until almost double about 1.5 hours. Bake at 375 F for an hour if using loaf pan or 30 minutes covered and 10 minutes uncovered at 450 F in the dutch oven .

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Fur Elise (Bagatelle in a Minor)
Audiomagic Royalty Free Stock Music Library 2:
Classical/Piano / Audiomagic Music Studios
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Wednesday, November 22, 2017

Bakewell Tart



Link to the recipe: https://www.thespruce.com/traditional-bakewell-tart-recipe-435041
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Royalty Free Music
Fur Elise (Bagatelle in a Minor)
Audiomagic Royalty Free Stock Music Library 2:
Classical/Piano / Audiomagic Music Studios
Bought on iTunes

Tuesday, November 7, 2017

Primitive Technology: Natural Draft Furnace



I built a natural draft furnace to test ideas about how hot a furnace could get without the use of bellows. Natural draft is the flow of air through a furnace due to rising hot air. The hot gasses in the fuel bed are more buoyant than the cold air outside the furnace causing them to rise. Fresh combustion air then enters the base of the furnace to replace the rising combustion gasses, keeping the fuel bed burning. This effect increases with: 1. the average temperature of the fuel bed relative to the outside air and 2. The height of the furnace. Two other important factors are the size of the tuyere (air entry pipe) and lump size of the fuel bed as these effect the resistance to airflow through the furnace. The furnace was tested with wood fuel and some ore was melted but produced no iron. High temperature were indeed produced (probably about 1200 c). These types of furnaces were once used for smelting copper and iron ores in around the world in ancient times, usually using charcoal as a fuel and in some cases wood too.
I designed the furnace using a formula from the book “The mastery and uses of fire in antiquity” by J.E. Rehder. It was designed to have a space velocity (air speed within the furnace) of 6 m per minute which is recommended for iron smelting. The furnace was 175 cm in total height but with a height of only 150 cm above the tuyere. The height between the air entry and the top of the furnace is what determines the strength of the draft, the space beneath the air entry is not included in the formula. The internal furnace diameter was 25 cm. The walls were about 12.5 cm thick at the base but got thinner with height. The tuyere (air entry pipe) was 7.5 cm internal diameter and about 20 cm long. The tuyere was placed into an opening in the base of the furnace and sealed with mud. The whole thing took about a week to make due to the slow drying time that was assisted by keeping a fire burning in side it. The furnace was designed to use charcoal (which in this case should be 2.5 cm diameter lumps) but I used wood to test it instead as it was easier to acquire. To test its melting ability, bog ore was found further down the creek and roasted. The roasted ore was then crushed and stored in a pot.
The furnace was filled with wood and lit from the top. The fire burnt down the furnace producing charcoal. On reaching the tuyere the fire then started burning the charcoal. Wood was also continually added from the top along with a few small handfuls of the roasted bog ore (not shown in the video). The temperature of hot objects can be visually estimated from their incandescence. After about an hour, the light coming out of the tuyere was high yellow to white hot indicating a temperature of at about 1200 c. Colour temperature charts vary but white hot is usually given to be at least 1200 c, examples of these charts can be found on the internet for reference. It was uncomfortable to stare into the tuyere and doing so left an after image when looking away, indicating the strength of its brightness. After about an hour and a half the furnace was left to burn out. When opened the next day the tuyere was covered in slag with bits of slag found on the furnace floor also.
This experiment shows that high temperatures can be achieved without the use of bellows or charcoal, which might significantly reduce labour in the production of iron. The furnace was technically easy to build as it was a simple vertical cylinder. When running, the wood added to the top of the furnace converts to charcoal in the upper part of the stack and is consumed in the lower part. The ore I used was new to me, normally I use iron bacteria as an ore. This new ore produced no metallic iron so I’m inclined to use iron bacteria in future. Natural draft furnaces were once used to smelt copper and iron ores in the past, usually with charcoal fuel and less frequently with wood. The main benefit of these furnaces seems to have been the reduction in labour they provide and simplified infrastructure (fewer workers and no bellows required during operation).

Saturday, November 4, 2017

Pear Tarte Tatin



Link to the recipe https://leitesculinaria.com/111294/recipes-pear-tarte-tatin.html

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Royalty Free Music
Fur Elise (Bagatelle in a Minor)
Audiomagic Royalty Free Stock Music Library 2:
Classical/Piano / Audiomagic Music Studios
Bought on iTunes