Takuichi Morinaga and Nobuo Siota
A special counter tube is devised for the determination of K in silumin. The form of the tube is shown in Fig. 1-(b),the dimension being 15 mm in diameter, 0.13 mm in thickness and 30 mm in the length for duralmin. After machining it to the desired form, this tube was inserted into the glass bulb with high tension added Pt wire, which was connected from one side to the other side of glass tube. Then the tube was enclosed with a mixture gas of anhydrous alcohol and argon. As the arrangement of the circuit is shown in Fig. 2,the main circuit consisted of three parts, namely stabiliser circuit,amplitude cirsuit and counter. In order to avoid the slight change of primary source of A.C.on the high tension side, which seemed to have instantaneous change on the counter, the form of series connection with 200 V neon lamp was adopted in our experiment. For the purpose of determining K in silumin, the above mentioned apparatus was used and satisfactory results were obtained by authors.
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