. The Bell System technical journal . NORMAL TANGENTIAL Fig. 5—^Methods for polarizing barium titanate to respond to normal and tan-gential forces. MEASURING FORCES AND WEAK IN S\\ ITCIIIXG AllAKATLS 47*.) CONTACT MAKE Z 30 - /^i^yi^^Kw CONTACT BREAK. 2 3 4 5 TIME IN MILLISECONDS Fig. 6—Oscillograph tracings of forces generated in make and break opera-tions. direction of the electrodes. In this process, the crystal is first poled, afterwhich the poling electrodes are ground or etched off and electrodes per-pendicular to the poling direction are put on by using a polimerizingcement in which sil
. The Bell System technical journal . NORMAL TANGENTIAL Fig. 5—^Methods for polarizing barium titanate to respond to normal and tan-gential forces. MEASURING FORCES AND WEAK IN S\\ ITCIIIXG AllAKATLS 47*.) CONTACT MAKE Z 30 - /^i^yi^^Kw CONTACT BREAK. 2 3 4 5 TIME IN MILLISECONDS Fig. 6—Oscillograph tracings of forces generated in make and break opera-tions. direction of the electrodes. In this process, the crystal is first poled, afterwhich the poling electrodes are ground or etched off and electrodes per-pendicular to the poling direction are put on by using a polimerizingcement in which silver dust is mixed. The cement serves not only as anelectrode but also holds the ceramic in the desired place. Fig. 7 showsan arrangement used for studying frictional forces. A small ceramic )y cm in cross-sectional area is glued to a metal base while a thinspecimen of the material whose frictional forces are to be studied isglued to the top surface. The forces cavised by a wire drawn over thesurface are transmitted to the crystal and generate a voltage which ap-pears on the oscillograph. Pictures of such force generated voltages are
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
