Abstract light vector background, seamless vector pattern for your graphic design themes. Pink op art vector background with beautiful gradient. Cool free seamless vector pattern stock art texture, great for your website design backdrop, invitation background, fashion or textile graphics. 模式 texture 形狀 免費光纖背景
A HAND-BOOK FOR THE STRANGER IN PHILADELPHIA. CONTAINING DESCRIPTIONS OF ALL THE OBJECTS OF INTEREST IN "the City and its environs" WITH VIEWS OF THE PUBLIC BUILDINGS, BY A PHILADELPHIAN. AUTHOR OF " THE AMERICAN GUIDE BOOK," ETC., ETC. Philadelphia: GEORGE S. APPLETON, 164 Chestnut Street. 1849. 望遠鏡 光纖 鏡頭 望遠鏡
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an illustration from Physics for Entertainment by Yakov Isidorovich Perelman from archive.org 雙目 鏡頭 光纖 雙筒望遠鏡頂視圖