00729cam a22002651 4500 7924253 BD-DhUL 20150105105700.0 751030s1955 enka 000 0 eng 55004221 (OCoLC)1745774 DLC FJ OCoLC DLC BD-DhUL premarc QC385 .T882 23 666.156 TWO Twyman, F. (Frank), 1876-1959. Optical glassworking / by F. Twyman. London : Hilger & Watts, c1955. viii, 275 p. : ill. ; 23 cm. GBP 1.15 Includes bibliographical references and index. Prisms. Lenses. ddc BK 27271 27271 0 0 ddc 0 666_156000000000000_TWO 0 NFIC 51369 DUSL DUSL GEN 1968-12-28 purchased 666.156 TWO A53893 2015-01-05 2015-01-05 BK