Diagram of a monocular using a Schmidt-Pechan prism. A monocular is a modified refracting telescope used to magnify the images of distant objects by passing light through a series of lenses and usually prisms, the application of prisms resulting in a lightweight, compact telescope.
Area code 609 serves telephones in southeastern and central New Jersey, including the cities of Trenton, Long Beach Island, Princeton, Hamilton and Atlantic City. In terms of geographic coverage, it is the largest in the state of New Jersey.In the original North American Number Plan (NANP), all of New Jersey was served by area code 201, until it was split in 1958 to create area 609.n terms of geographic coverage, it is the largest in the state of New Jersey. In the original North American Number Plan (NANP), all of New Jersey was served by area code 201, until it was split in 1958 to create area 609.
Area code 639 was put into service on 05/25/13. Area code 639 is an overlay of area code 306.Mandatory 10 digit dialing is required. Ten digit dialing (area code + seven digit number) is necessary in the 306/639 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.rea Code 639 History: Area code 639 was put into service on 05/25/13. Area code 639 is an overlay of area code 306. Mandatory 10 digit dialing is required.