The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 14
r^^^^i Fig. 2. … The above engraving shows an improved form of safety-valvefor steam-boilers, invented by Mr. Alfred Gregory, and describedin the Mechanics Magazine, wliich has met with tlie approbation ofseveral eminent engineers. The advantages do not require to be much insisted on. Thepractice of overloading the…
Architecture · Civil engineering · Science
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