00000nam 2200000za 4500 9.867332 CaOODSP 20221107162302 cr ||||||||||| 190118s1958 onca |o f|0| 0 eng d CaOODSP eng n-cn--- M38-1/15-1958E-PDF Alexander, G. E. A radioactive dial marker for the Decca navigational aid [electronic resource] / by G. E. Alexander & G. G. Eichholz. Ottawa : Department of Mines and Technical Surveys, 1958. ii, 8 p. : ills. Mines Branch Research Report ; R 15. Digitized edition from print [produced by Natural Resources Canada]. "June 2, 1958." Cover title. "A small auxiliary unit has been designed for use in conjunction with a Decca Navigational System on survey flights. The unit is intended to trigger a relay system which actuates an aerial camera every time the dial pointer on the Decca dial passes through zero. For this purpose, the pointer tip has been coated with radioactive caesium-137 whose activity is detected by a Geiger tube located above the dial face"--Abstract, p. i. gccst Minerals gccst Metals Eichholz, G. G. Canada. Department of Mines and Technical Surveys. Canada. Mines Branch. Research report (Canada. Mines Branch) R 15. (CaOODSP)9.855660 PDF 2.54 MB https://publications.gc.ca/collections/collection_2019/rncan-nrcan/m38-1/M38-1-15-1958-eng.pdf