Blowpipe Experiment

Comparison of dental student silver soldering using an orthodontic blowpipe or Hydroflame.

This study compared fabr/cation of silver solder joints by dental students using an orthodontic blowpipe .or a Hydroflame ® soldering unit. Fifty-eight students attended a lecture and observed demonstrations of silver solder/ng. Thirty students used a Hydroflame ® to prepare one practice solder joint and two technique solder joints. These students then prepared one practice solder joint and two...

The Hare-clarke Controversy over the Invention of the Improved Gas Blowpipe

Credit for the initial invention of the gas blowpipe has been marked by an unusually large amount of controversy (1), involving bitter charges of plagiarism and intellectual dishonesty. An example of this involves the American chemist Robert Hare,1781-1858 (2), who claimed that Edward Clarke, Professor of Mineralogy at Cambridge University (3), had falsely taken credit for the invention of the ...

Animal Rights Consideration is a Necessity in Conducting an Experiment

An Introduction to Natural Experiment Studies

در دو سخن سردبیری شماره‌های قبل به مطالعات مداخله‌ای (Interventional and/or experimental studies) [1] و مطالعات نیمه تجربی (studies Quasi-experiment) [2] پرداختیم. همان جا، به این نکته اشاره کردیم که برای اندازه‌گیری کارآیی یک دارو، واکسن، برنامه بهداشت عمومی و متغیرهای دیگری از این دست، مطالعات مداخله‌ای بهترین گزینه هستند. تقسیم تصادفی و کورسازی از مؤلفه‌های اساسی یک مطالعه مداخله‌ای است [1]....

Experiment: The experiment in living

This copy has been supplied on the understanding that it is copyright material. Duplication or sale of all or part of any of the GRO Data Collections is not permitted, and no quotation or excerpt from the work may be published without the prior written consent of the copyright holder/s. ÔThere is nothing that is quite so reminiscent of GarfinkelÕs demonstrational methodology as the ÒhappeningÓ,...