. Arthur and Fritz Kahn Collection 1889-1932. Kahn, Fritz 1888-1968; Kahn, Arthur David 1850-1928; Natural history illustrators; Natural history. INTERNATIONAL AMPHITHEATRE CHICAGO MAY 17-20. 1954 Q Stnd mt â¢xpvditvd rcglitrotlon tick«U for th« Exposition. No rogittrotion fo«. D Send mt rogittrotion formt for th« AAatoriolt Confcronc«. '-%- (plaot* print) Titit. .^ Compony. Addrtts City. .Zont. Stoto. Mail To: D*,CLAPP * POLIAK, Inc. Show Manogtntont, 341 Mmtison Avo., Ntw York 17, N. Y. Now â an exposition for product designers, research and developtnent engineers, market- ing and
. Arthur and Fritz Kahn Collection 1889-1932. Kahn, Fritz 1888-1968; Kahn, Arthur David 1850-1928; Natural history illustrators; Natural history. INTERNATIONAL AMPHITHEATRE CHICAGO MAY 17-20. 1954 Q Stnd mt â¢xpvditvd rcglitrotlon tick«U for th« Exposition. No rogittrotion fo«. D Send mt rogittrotion formt for th« AAatoriolt Confcronc«. '-%- (plaot* print) Titit. .^ Compony. Addrtts City. .Zont. Stoto. Mail To: D*,CLAPP * POLIAK, Inc. Show Manogtntont, 341 Mmtison Avo., Ntw York 17, N. Y. Now â an exposition for product designers, research and developtnent engineers, market- ing and sales executives. The only exposition that presents all materiais in one place, at one time, under one roof. IVs a scientific showcase for the new materiais that will place your comparTy*s products out ahead of competition. 77% of last year's attend- ance found something brand new. And, 29%* discovered uses for formerly rejected mate- riais â according to an inde- pendently conducted survey. This will be a year of great new developments in new mate- riais and basic product com- ponents. Send the coupon today for tickets. *Total$ moro than 100% bocouso roiponc/onfs antw^fd moro than ont qu0$lion, BaiU Material» Conferefice Held concurrently with the Exposition. Led by T, C, Du Mond, editor of Materials änd Metfiods. Covers new ap- plications of CALCULATIONS of all kinds can be «osily soivvd on th« BINARY CIRCULAR SLIDE RULE Thls rule will quickly solve tlie siinplest as well as the niore difflcult Problems Involvinu cuitulations in Arlth- iiietic. Algebra and Trigonumetry. Aiiy nuinber of fac- tors can be iiandled In long and difflcult calculations. Tiie C Scale of tlie Binary is 25 Indies long wlth gradii- ations 25% further apart than those of a 20-lnch sllde rule. The CI. A. K, & Log scales are dlvlded as closely as a 20-lncl) slide ruie. I^og-Log scale extends froni to 1, Oires Trlg. funetions from 0 to 90 degrees on
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