NOTES
June, 1956
801
ent contact with the mercury is made by the pointed tungsten rod (D). This rod, which is centered by the glass bead (E), is surrounded by an electrically-insulating sheath of polystyrene (C) and is activated by the shaft (B) which is threaded with a 0.006-em. pitch and which engages two tapped brass blocks (A) mounted rigidly with respect to the body. Preliminary studies revealed that nickel, monel, and stainless steels react with P-KHFZ with evolution of gas. No reaction with molybdenum was observed a t temperatures as high as 260" over periods of several weeks. The glass apparatus depicted in Fig. 2 illustrates 40 80 120 160 200 240 the method of filling the dilatometer with mercury. After evacuation of the inverted dilatometer for Temp., "C. several days at
