. Bulletin - United States National Museum. Science. [25] COLLECTING AND PREPARING FOSSILS—SCHUCHERT.. All of the marks left by cutting- tools should be removed. The white scratches can all,be removed with very dilute muriatic acid and brush- ing, but be careful that the acid is not strong, otherwise calcareous fossils will take on a gloss which is objectionable. The best way to trim slabs is to cut them with thin, tin circular saws edged with diamond dust, operated by either foot or steam power, or by breaking between two sharp-edged jaws, the upper one of which is made to descend by whirl- i

. Bulletin - United States National Museum. Science. [25] COLLECTING AND PREPARING FOSSILS—SCHUCHERT.. All of the marks left by cutting- tools should be removed. The white scratches can all,be removed with very dilute muriatic acid and brush- ing, but be careful that the acid is not strong, otherwise calcareous fossils will take on a gloss which is objectionable. The best way to trim slabs is to cut them with thin, tin circular saws edged with diamond dust, operated by either foot or steam power, or by breaking between two sharp-edged jaws, the upper one of which is made to descend by whirl- i Stock Photo
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Library Book Collection / Alamy Stock Photo

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RGW8Y5

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2839 x 881 px | 24 x 7.5 cm | 9.5 x 2.9 inches | 300dpi

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. Bulletin - United States National Museum. Science. [25] COLLECTING AND PREPARING FOSSILS—SCHUCHERT.. All of the marks left by cutting- tools should be removed. The white scratches can all,be removed with very dilute muriatic acid and brush- ing, but be careful that the acid is not strong, otherwise calcareous fossils will take on a gloss which is objectionable. The best way to trim slabs is to cut them with thin, tin circular saws edged with diamond dust, operated by either foot or steam power, or by breaking between two sharp-edged jaws, the upper one of which is made to descend by whirl- ing a large wheel working on a slow gradient screw. A number of forms of pincers and cutting tools are used in cut- ting and trimming fig. 5.-Wire brush. specimens. The more important of these are here reproduced (see figs. 6-12). Small hammers are useful, but great care must be taken to pre- vent shattering or breaking the fossil. Broken fossils, if small, are best mended with fish glue; when large enough plaster of paris should be added to give the glue greater body. Sand bags are very serviceable in working slabs and large fossils, particularly when chisels and hammers are to be used. In remov- ing rock from skeletons, sand bags are of the greatest service to block up and remove pressure from weak spots or to ease strains when turn- ing specimens. Cleaning with acids and j>otos/i.—Calcareousrocks with siliceous fossils can be etclied in a solution of about one part of com- mercial muriatic acid to two parts of water. Use dishes of various sizes and set these out in the air, otherwise the escap- ing fumes will corrode all metallic surfaces in the room. Once or twice each day the rock can be subjected to fresh dilute acid, but first wash away the dead acid under a stream of running water. Also transfer the loose material at the bottom of the dish to another with clear water, in Avhich it is best to leave the material for a few days to soak out all of the acid, otherwise

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