IMPROVISED BLACK POWDER
Black powder can be prepared in a simple, safe manner. It may be used as blasting or gun powder.
MATERIAL REQUIRED:
Potassium nitrate, granulated, 3 cups (3/4 liter) (see Sect. I, No. 2)
Wood charcoal, powdered, 2 cups (1/2 liter)
Alcohol, 5 pints (2-1/2 liters) (whiskey, rubbing alcohol, etc.)
Water, 3 cups (3/4 liter)
Sulfur, powdered, 1/2 cup (1/8 liter) 2 Buckets each 2 gallon (7-1/2 liters) capacity, at least one of which is heat resistant (metal, ceramic, etc.) Flat window screening, at least 1 foot (30 cm) square
Heat source
Large wooden stick
Cloth, at least 2 feet (60 cm) square

PROCEDURE:
1. Place alcohol in one of the buckets.
2. Place potassium nitrate, charcoal, and sulfur in the heat resistant bucket. Add 1 cup water and mix thoroughly with wooden stick until all ingredients are dissolved.
3. Add remaining water (2 cups) to mixture. Place bucket on heat source and stir until small bubbles begin to form.
4. Remove bucket from heat and pour mixture into alcohol while stirring vigorously.
5. Let alcohol mixture stand about 5 minutes. Strain mixture through cloth to obtain black powder. Discard liquid. Wrap cloth around black powder and squeexe to remove all excess liquid.
6. Place screening over dry bucket. Place workable amount of damp powder on screen and granulate by rubbing solid through screen.
7. Spread granulated black powder on flat dry surface so that layer about 1/2 inch (1-1/4 cm) is formed. Allow to dry. Use radiator, or direct sunlight. This should be dried as soon as possible, preferably in one hour.

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The Phillips head screw is a plague on industrial society and an affront to the dignity of man. Its persistence is entirely the result of a deference to the lower castes. The American design was originally developed as a solution to fast production at the cost of precision.
The patent was filed in the 1930s during a time when power tools were beginning to be being used on production lines for speed and efficiency. The socket the driver interfaces with was given a geometry to ensure the driver cams out of the head to mitigate over torqueing.