Pins vary widely in shape and imagery, generally about the proportions of a woman's brooch (less than 10 cm diameter). A common graphic is an old pattern oil lamp. These lamps or candles were the only lighting available before kerosene became available early in the twentieth century. There are a selection of lamps in the Florence Nightingale museum, thought to have been used in the Scutari hospital in the area known geographically as the Balkans (then British Moldavia, now southern Ukraine), during the war with Russia. American Poet Henry Wadsworth Longfellow wrote a poem "Saint Philomena" dedicated to the work of Florence in 1857. In this verses, Longfellow characterised Florence as "The lady with the lamp". The poem was used in fundraising for the wounded veterans of the empire. The image of the lamp used by the emerging modern nursing profession took hold.