WARSAW (AP).- Chopin experts are trying to determine whether a photo that has surfaced in Poland is really of the 19th century composer. If authentic, it would be only the third known photograph of Chopin, who lived from 1810-1849. Wladyslaw Zuchowski, a photographer and gallery owner in Gdansk, said Thursday that he bought the daguerreotype, the earliest type of photograph, from a private owner in Scotland in December. The framed copper and silver image bears the imprinted year of 1849, when Chopin died in Paris, and the name of Louis Auguste Bisson, a French photographer who took at least one photograph of Chopin during the pianist’s lifetime. On the frame is attached a piece of paper with Frederic Chopin’s name. Zuchowski said he believes it might come from a collection gathered by Jane Stirling, a Scottish