Show ir j l i r tW J THE SILVER DOLLAR How It Can Be Made Mad to fo Spin on Two Tw Needle Points How Flow can we Wc make a silver sliver do dollar dolla r turn quickly and continuously ou on it Its axis Very easy says some somo one pulling out a silver sliver dollar doUar and standIng stand Ing tag It on its rim He lie places the index in in- index dex linger of tho the left hand band on It an and flips the tho coin with his his- right hand with such velocity vc ve- The Tho dollar will turn that the C eye eye cannot follow li It This will last for some time until the motion gradually decreases an and finally stops Not bad but we the can do better W We No borrow tho silver dollar doUar mark th the ends of its diameter carefully an and place it on the tho table tabo Then we wo lift JUt th the coin con with the tho help of two needles inserting the needles at the tw two marked points bring it Jt close to th the mouth and blow at it The Tho coin will wll turn driven by the pressure of the air I t Doing the Trick with remarkable velocity and will remain re- re remain re reo main in motion as a little blowing from time to time will keep its speed from slackening But Dut how can we find the diameter of the coin in the tho right moment This is very easy Take a piece of paper and draw with the help df a n compass a circle approximately the size of the silver sUver dollar doar and draw a straight line through the center Placing the coin in this circle we can easily mark tho the ends of tho line on the rim of or the dollar |