FIELD: medicine; manufacture of medical ware.
SUBSTANCE: test-tube has case. Cross-lateral section of test-tube has one line of external boundary of section and one line of internal boundary of section. Line of section external boundary of all the possible pairs of points has two pints being mostly distant one from other. Line of internal boundary of section of all possible pairs of points has two points being most distant one from other. Straight line drawn onto plane of section through points being most distant one from other and which are disposed onto line of external boundary of section, is disposed at angle of 0,017 radian to 3,123 radian to straight line drawn onto plane of section. Thickness of test-tube along external border of section varies. Moreover one part of line of external section in rectangular coordinate system has onto plane is descried by equation of (X/A)2-(Y/B)2 -1=0, where X and Y are coordinate axes, A and B are rational numbers different from zero. One part of line of internal boundary of cross-section in rectangular coordinate system is described by equation of (X/C)2-(Y/D)2-1=0, where X and Y are coordinates, C and D are rational numbers different from zero.
EFFECT: improved efficiency of heat transfer.
10 cl, 14 dwg
