The Science record; a compendium of scientific progress and discovery . r view, Fig. 7. This last MISCELLANEOUS. 573 mentioned drawing has been made directlystrument constantly used by Mr. H. , special artist of the ScientificAmerican, and to that gentleman weare indebted for an explanation of aningenious manner of constructing adevice as represented from wood andother simple materials. The prismcan be obtained at a small cost fromany optician, and the rest of the ap-paratus any one can cut out of black-walnut with a knife, and perhaps agimlet or two. The thumbscrewsused are of brass, of
The Science record; a compendium of scientific progress and discovery . r view, Fig. 7. This last MISCELLANEOUS. 573 mentioned drawing has been made directlystrument constantly used by Mr. H. , special artist of the ScientificAmerican, and to that gentleman weare indebted for an explanation of aningenious manner of constructing adevice as represented from wood andother simple materials. The prismcan be obtained at a small cost fromany optician, and the rest of the ap-paratus any one can cut out of black-walnut with a knife, and perhaps agimlet or two. The thumbscrewsused are of brass, of the kind employ-ed for shutter-fastenings, and can beprocured of any hardware dealer for afew cents each. B, in Fig. 7, is theprism and A is a section of one of thejoints, showing how the apparatusmay be easily adjusted. A movablerod secured by a thumbscrew regu-lates the height of the prism, and thesimple clamp shown secures it to theedge of the table. The entire arrange-ment thus constructed, we are in-formed, costs, exclusive of the prisma little over one fig. 7.
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
