Research on the Heavy Gas Action Characteristics of BF Type Double Float Ball Gas Relay Under Transient Oil Flow Impact

The gas relay is a common non-electric protection device inside transformers, installed on the connecting pipeline between the transformer oil tank and the oil conservator.When the transformer malfunctions and the oil flow value reaches the alarecre.com heavy gas setting value of the gas relay, a heavy gas alarm is triggered.Therefore, accurately a

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How to Become an Obstetric Authority? Demarcation Dispute between Midwives and Doctors in German Midwifery Manuals from the Early Modern Period

The subject of the study is the analysis of early modern midwifery manuals from German-speaking regions written in the period between the second half of the seventeenth century and the first half of the eighteenth century.This period can be described as the beginning of the so-called demarcation dispute between the midwives and obstetricians.A char

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