FIELD: instrument making.
SUBSTANCE: proposed frame consists of lengthwise, crosswise and diagonal rods interjointed at cross points. Said rods are composite and are jointed together be bimetal rings along their ODs and IDs. Note here that said rods, at their joint with bimetal rings, have lengthwise cutouts made for fringe effect length. Note here that geometrical sizes of composite cylindrical rods, bimetal wings as well as physical and mechanical properties of used material are interrelated by relationships specified in invention claim.
EFFECT: stability of frame linear sizes in irregular temperature field that allows reducing telescope defocusing.
6 dwg
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