โ Scribed by Donnan, F. G.
No coin nor oath required. For personal study only.
Issued by the British Opticxl lnstiunient Xuniifncturcrs' ilssocicition. 1'17. zii. -+-3%. (London: Constublc und Go., Ltd. 1921.) Price 21s. n e t . TI10 rcricwcr is ncqi~nintcd with no volumo moro uns:itisfnctory tlinn tlio prcscnt 0110 within tlic :inhit of ISnglisli scientific liternturc. He is lieartily in ngrccmcnt wit11 tliosc rcsponsiblo for tho iss!io of tho volumo in tlicjr belief tlint li a CCIICISO dcfinition of c:icli instrume~it, togctlier witli illustrations of tho most irnportnnt types, will be of real service to scientific incn and tlio iiidustry." How far docs tlic voluiuo go in tlio directioii of providing siicli real service? Tlic book can be rouglily divided into tlircc sections. Opening n-itli nn alto~ctticr cstrnncoi~s gcncr:il view front aboru tho Nationnl Physical Laboratory, and thrco illustr:itions of oper:itioiis carried out tlicrcnt, perfectly unintclligiblo i n tlic :ibsenco of :iny a c c o n ~p a n y ~~~g letterpress, tlio rcm:iinder of tliis section is devoted t o sliort dcscriptions of I t TI10 Ilritisli Optical I n s t r ~y m t Compiiny," " Xavigating J~~striinieiits," Tlie 1toy:iI Alctcorological Society,"
Ilritisli Optical Gkss," nnd Ti10 Iloyal Obscrv:itory, Orcc~~wicI~." Tlio various niattcrs nro to a largo extent treated Iiistorically, and somo :it least do not nppcnr to I1:iro b c ~n written specifically for tho prcscnt rolumc. T1i:it 011 British Optical G1:iss is, iii tho writer's opinion, tho worst. Sticli conimon-placc terms ns dispcrsivo power " nr? \vrongly dcfincd, nnd nn nltogctlier wrong idea is conveycd of tho produc-
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