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Many small coils wound with Bismuth based conductor have been manufactured with t h e W i n d a n d React technique in solenoid shape. T h e construction of t h e coils has been integrated with an experimental investigation of t h e effect of curvature radius on t h e critical current and of t h e influence of different insulation materials (braids of quartz and of different ceramics) on t h e characteristics of t h e conductor a n d of t h e winding. A variety o f conductor lay-out have been tested: Bi-2212/Ag with mono and multifilament design, pure silver or Ag-alloy as stabilizer. T h e influence of different heat treatment conditions -temperature, r a m p rate a n d atmosphere-on t h e conductor a n d on t h e coils performances is presented. T h e performances of t h e coils, wound with conductor length from 2 to 36 m, are compared with respect to t h e short sample critical currents at 4.2 and 77 K and t h e measurements of t h e irreversibility lines are discussed. I n few coils I, is 50% of t h e short sample value, reaching 80% in t h e best case.

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