. The Bell System technical journal . ine; each arc that crosses the F axis connects all points with thesame F direction-cosine. For example, the normal to the major face of the NT cut is plotted asfollows: .64 units are marked off in a positive direction (down) on the A axis (to X-RAYS AND ORIENTATION OF QUARTZ CRYSTALS 315 a point between (21-3) and (21-2). Then, in the direction of the east-west arcs, .1 unit is marked off to the right of the X axis. The point solocated is found to be about half way between the .7 and .8 concentriccircles, that is, to have a Z component of about .75, as cal
. The Bell System technical journal . ine; each arc that crosses the F axis connects all points with thesame F direction-cosine. For example, the normal to the major face of the NT cut is plotted asfollows: .64 units are marked off in a positive direction (down) on the A axis (to X-RAYS AND ORIENTATION OF QUARTZ CRYSTALS 315 a point between (21-3) and (21-2). Then, in the direction of the east-west arcs, .1 unit is marked off to the right of the X axis. The point solocated is found to be about half way between the .7 and .8 concentriccircles, that is, to have a Z component of about .75, as calculated lies about half way between atomic plane normals (21-3) and (31-3). The degree scale given in Fig. may be used to determine roughly theangle between any two points on the diagram. The scale is non-uniformand for any particular region of the diagram that portion of the scale shouldbe used that falls on that region when the zero mark on the scale is placedat the center of the diagram. INSTRUMENT PLANE OFINSTRUMENT. Fig. —Goniometry case (d): Atomic plane intersecting plate-face in a line whichis neither normal nor parallel to the plane of the instrument (general case). In the present example the part of the scale to be used is around the 40°mark and the plate face is found to make angles of less than 10° with both(2l-3) and (31-3). In general the atomic planes with the smaller indices are Hkely to givethe stronger reflections. Therefore the better plane to try first is (21-3).The indices of this plane are not shown in this form in Table I, but by themethod described in Section it may be seen that a plane with indices11-3 would have the same 6 value for X-ray reflection. From Table I wesee that 6 for atomic plane 11-3 is 32° 03. In order to determine the angles g and g -\- g (Fig. ) the orientationof the atomic plane with respect to the plate edges must be found. 316 BELL SYSTEM TECHNICAL JOURNAL Determination of the Orientation of an Ato
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