A plain taper attachment for the lathe is illustrated in Figure7-69. A bed bracket attaches to the lathe bed and keeps theangle plate from moving to the left or the right. The carriagebracket moves along the underside of the angle plate in adovetail and keeps the angle plate from moving in or out onthe bed bracket.
The Bryozoa, also known as Polyzoa, Ectoprocta or commonly as moss animals, are a phylum of aquatic invertebrate animals.Typically about 0.5 millimetres (0.020 in) long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a crown of tentacles lined with cilia.nother group of animals discovered subsequently, whose filtering mechanism looked similar, was also included in Bryozoa until 1869, when the two groups were noted to be very different internally. The more recently discovered group was given the name Entoprocta, while the original Bryozoa were called Ectoprocta.
Phylum Arthropoda. This is the most extensive phylum in the animal kingdom. It is composed of 3/4 of all known species. Approximately 900,000 species of arthropods have been recorded. Included are spiders, scorpions, ticks, mites crustaceans, millipedes, centipedes, insects, and some others.There is an extended fossil record.Arthropods are eucoelomate protostomes with well-developed organ systems.Most species have combined or fused somites and appendages into functional groups called tagmata for specialized purposes. Although all types-carnivorous, omnivorous, and symbiotic-occur, the majority are herbivorous.In diversity of ecological distribution, the arthropods have no rivals.pproximately 900,000 species of arthropods have been recorded. Included are spiders, scorpions, ticks, mites crustaceans, millipedes, centipedes, insects, and some others. There is an extended fossil record. Arthropods are eucoelomate protostomes with well-developed organ systems.