Seriation sequence dating
We count the types of musical recording methods found in each of our junkyard samples, and then work out the percentages.
Of all the music recording artifacts in our sample from Junkyard E, 10% are related to 45 rpm technology; 20% to 8-tracks; 60% are related to cassette tapes and 10% are CD-Rom parts.
We don't have historical information about the junkyards--they were illegal dumping areas and no county records have been kept on them.
For a study we're doing on, say, the availability of music in rural locations during the 20th century, we'd like to know more about the deposits in these illicit junkyards.
One early recording method consisted of large plastic disks which could only be played on a huge device called a gramophone.
The gramophone dragged a needle in a spiral groove at a rate of 78 revolutions per minute (rpm).
He assumed an evolutionary trajectory in which the handles became increasingly less pronounced through time, and used this characteristic among others to organize the assemblages.The basic premise is to arrange in sequence objects of material culture (anything from microliths to monumental architecture) based on degree of similarity.