INSTRUMENTATION
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Figure 2. Tensile fracture in soft iron wire Preparation: Stretched by hand to breaking point. Clamped onto specimen stub which was coated with "Aquadag." Specimen itself uncoated Print sizes: Micrographs A, B, and C are about 5 0 % of the size of the image shown by the instrument. Micrograph D is a print enlargement of C Magnifications: Approximately χ 73 (Α), χ 145 (Β), χ 445 (C), X 830 (D) Gun potential: 20 kv. for all results
final commentator on t h e subject, the bound notes and "proceedings" of the Institute of some 256 pages contain valuable information and suggestions from t h e lecturers who journeyed to St. Louis from all parts of the country. We would hope t h a t the notes might find wider circulation. For some time, we have been hoping t h a t Professor K u r t S. Lion of M.I.T. would find t h e time and inclination to extend the scope of his excellent mono
graph "Instrumentation in Scientific Research (Electrical I n p u t Transduc e r s ) " McGraw Hill Book Co., Inc., Ν . Υ., Ν . Υ., 1959. I t seems more important than ever to emphasize t h e general principles of instrumentation without reference to any particular or specific branch of science or technology. I t is one of the consequences of spe cialization t h a t still hinders the wider use of techniques being practiced by our fellow scientists in other fields.
There is only one Tygon Tub ing, a product of The United States Stoneware Company. For your protection, every foot is branded with the Tygon name and formulation number. Plastic & Synthetics Division 254-J
U. S. S T O N E W A R E Akron, Ohio 44309 Circle No. 158 on Readers' Service Card VOL. 3 8 , NO. 8, JULY 1966
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