Hence most blowpipes are now made with a cavity for retaining the moisture. [Please select]
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The chemist has his acids, and reagents, and blowpipes, etc. [Please select]
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All are useful, and all have their special applications, but, for the present, we will consider the ordinary types of bellows and blowpipes, such as one usually finds in a chemical or physical laboratory. [Please select]
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