30 insulated wireas your standard Ohm.You could, of course, take any otherlength ofany size as your standard, but it will be best to make yourcoils with a certain number of Ohms resistance. If you haveno No.30 wire, youmay use39 ft. 1 in. ofanbsp;...
|Title||:||How Two Boys Made Their Own Electrical Apparatus: Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity|
|Author||:||Thomas Matthew St. John|
|Publisher||:||Library of Alexandria - 1901|