LATHE TOOL POST GRINDERGeneral The tool post grinder is a portable grinding machine that canbe mounted on the compound rest of a lathe in place of thetool post. It can be used to machine work that is too hard tocut by ordinary means or to machine work that requires a veryfine finish.
Trilobites are an extinct group of arthropods (jointed-legged animals) known from more than 10,000 fossil species. The group Trilobita existed from early in the Cambrian Period (520 million years ago) until the end of the Permian Period (250 million years ago).The name Trilobita is derived from the three (tri-) lobed structure of the exoskeleton, which has a raised central lobe (or axis) and a pair of side lobes, called pleurae.efore the first trilobite with its legs fossilised was described in 1870, it was already well established that Trilobita belonged to the Arthropoda. Arthropods are the most species-rich animal phylum living today, and have been the most diverse group of multicellular animals since the Early Cambrian.
These Kansas fossils are records of some of the last trilobites to live on Earth. Trilobite fossils found in Kansas rocks often consist of the pygidia, or tails, of either Ameura or Ditomopyge. This specimen of Ameura was collected from the Pennsylvanian Drum Limestone of Independence, Kansas.escription: Trilobites were some of the first multicellular animals to live in the world's oceans. Their fossil record extends back 530 million years to the early part of the Cambrian Period and indicates that trilobites evolved rapidly in the shallow seas of this time.