. The American journal of roentgenology, radium therapy and nuclear medicine . has not yetbeen satisfactorily solved. Meanwhile theshutter is operated on two phase currentfrom a small auxiliary converter. While itis theoretically possible to obtain two phasecurrent from single phase by properlybalancing two circuits containing respec-tively an inductance and a condenser, thedifficulties encountered have made it toodelicate and temperamental a balance forpractical work up to the present Caldwell was very much interestedin this matter of phase-splitting and hopedto eliminate the auxil
. The American journal of roentgenology, radium therapy and nuclear medicine . has not yetbeen satisfactorily solved. Meanwhile theshutter is operated on two phase currentfrom a small auxiliary converter. While itis theoretically possible to obtain two phasecurrent from single phase by properlybalancing two circuits containing respec-tively an inductance and a condenser, thedifficulties encountered have made it toodelicate and temperamental a balance forpractical work up to the present Caldwell was very much interestedin this matter of phase-splitting and hopedto eliminate the auxiliary two phase con-vertor. The great difficulty with all syn-chronous motors of this type is that theyhave very little torque to hold them insynchronism; and no torque for startingunless an auxiliary split-phase startingwinding is provided. It is hoped to obtaina motor that will be easily started from asingle phase line, that will hold synchro-nism well without oscillation or hunting,and if possible, to operate over such a A Description of the Caldwell Stereofluoroscope 549. Fig. 2. General View of the Apparatus. Table Top Removed.
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