CARL RUSSO/Staff photo. Peter Machnik of Salem, a retired electronic engineer from Honeywell and MKS Instruments shows the kids a magnetic disk form the 1970's. A dozen boys and girls learned about electric circuits and exploring electronics under the guidance of Machnik while making items of their choice using clay at the Kelley Library in Salem yesterday. The program was one of several summer fun learning classes held at the library conducted by Youth Service Librarian, Brittany Tuttle. 7/29/2014.