An emergency tire stem core remover can be made from a cotter key when both legs have been cut off to equal lengths, put a nail in the loop to creat a handle. Concrete allways takes 125% of unmixed volume to creat a known volume due to compaction factors. An automotive alternator will display a magnetic field when a screwdriver is dangled near the center when it is running, the front will be stronger than the back. No magnetic field mean defective. Fill dirt takes 125% also due to 'fluffing ' dureing handleing. Lost all the lug nuts off of a wheel? Steal one from each other wheel to limp home. 220 currant is nothing more than a pair of 110's. They can share a common nuteral/ground. Cubic inches can be calculated on a litered engine by multiplying by .61. Doubling a pipes size increases the flow by 300% plus the original flow. Iron or steel boilts can be tourched out of cast iron hubs, the steel melts at about 2000 degree, the cast iron around 3600. Concrete blocks (8 x 8 x 16) equals 1 square foot of space in a wall. Each weighs about 38 to 42 pounds. This is just a beginning, post your knowledges here.

Gosh Mitch the only rule of thumb I can think of is the more expensive the car the worse the driver will be. Kirk

actually a block is a little less than a square foot. 4feet x 4 feet = 16 square feet, it takes 18 block to cover the same area. cubic feet for an 8 inch block is a bigger difference. if you want to figure how many block it will take. measure length in feet and multiply by 3 and divide the answer by 4. for hiegth multiply feet by 3 and devide by 2. so if you had a wall 20' long and 6' high 20x3 devided x 4 =15 block long 6 x 3 devided x2 =9 block high 15 x 9 = 135 block 50 block per bag of mortar = 3 bags 20 shovels sand per bag = 60 shovels or 600lbs 6 times as many standard size brick to cover same area about 200 brick per bag of mortar you can mutiply square feet by 7 to figure brick. it's actually only 6.75 but you need the extra for breakage if you are trying to square something up and need to know the distance from corner to corner diagonally multiply lenght by length in inches, then width by width then add those two numbers and devide by square root = diagonal distance in inches