Brass body

A fin-stabilized projectile must have its center of mass well forward of its center of pressure. This means that the point thru which gravity can be said to act must be well in advance of the point at which the aerodynamic forces act. A good example of this is a metal dart which has a brass body of considerable density and fins placed on a lightweight wooden boom well to the rear... 

Containment of Materials. All experimental work with hexafluorides was carried out in a metal manifold constructed of nickel tubing and fittings which could be evacuated by both mechanical and diffusion pumps. The manifold incorporated Monel diaphragm valves and a number of 1 in. diameter valves with brass bodies. Monel bellows, and Teflon seats. The hexafluorides were transferred between vessels in the manifold by vacuum distillation at room temperature. 

If the distance between the glass plates was small enough the lower plate pulled the upper plate down over a certain distance. This distance was measured by means of the decrease of the capacity of the condenser formed by the two silvered microscope cover-glasses Cl and C2, Cl being fixed to the holder D with insulating wax. C2 was immovably fixed to the massive brass body E. The other brass body G carried both E and the fixed end of the spring F. 

This particular arrester has a brass body, as most do, which is not appropriate for long term use in a system with a KOH electrolyte. Stainless steel arresters are preferred, but are more expensive than the brass. Since our system is experimental and is frequently assembled and disassembled, any corrosion problems can be monitored, so we opted for brass. 

We used a brass body filter with a polyurethane bowl as a low cost alternative to purchasing another stainless steel bodied filter. This worked well for the experimental purposes, but stainless steel is the appropriate metal for this component in this type of system. 

Filter with brass body and polyurethane bowl 34" pipe, 22 scfm max McMaster-Carr 8287K12 1... 

Figure 5.2 Top Sketch of a jet separator device used to couple a packed column GC to a mass spectrometer. The dimensions are typically d = 100 p.m and d2 and d3 both 250-300 p.m. The two tubes leading to the MS and from the GC, and drawn down to small apertures, must be accurately aligned. Such devices are normally fabricated of an inert material such as borosilicate glass. Bottom Schematic diagram of an experimental jet separator designed with an adjustable inter-jet gap, in (A) cross-section and (B) axial view, (a) delivery capillary connected to transfer line from GC (b) gap adjustment threaded disk (c) nozzles (d) window (e) receiving capillary connected to the ion source (f) gap zero-setting threaded disk (g) expansion chamber (h) vacuum port (i) brass body of device (j) cartridge heater (not visible in cross-section). Reproduced from Pongpun, J. Mass Spectrom. 35, 1105 (2000), with permission of John Wiley Sons, Ltd.

FIGURE 4.68 When using the stroke movement of a file hand piece, a brass body is moved over the surface with diamond paste adding fluid without pressure... 

Helium is used as the tank pressurant, and pressure is regulated by means of a standard brass-bodied regulator employing neoprene diaphragms and plastic... 

Figure A2.5.18. Body-centred cubic arrangement of (3-brass (CiiZn) at low temperature showing two interpenetrating simple cubic superlattices, one all Cu, the other all Zn, and a single lattice of randomly distributed atoms at high temperature. Reproduced from Hildebrand J H and Scott R L 1950 The Solubility of Nonelectrolytes 3rd edn (New York Reinliold) p 342.

Silica. The main uses of siUca are in the treads of off-the-road tines for improved chunking and tear resistance and as a component of the bonding system for brass and 2inc-plated steel cord. These are commonly used in radial passenger and tmck tire belt skim stock. In addition the body pHes of steel radial tmck tires, hoses and belts, and footwear use significant volumes of siUca as a reinforcing filler. 

Let us first consider, as an example, the copper-zinc system of alloys.1 The ordinary yellow brass of commerce is restricted in composition to the first (copper-rich) phase of the system. This phase, which has the face-centered cubic structure characteristic of copper, is followed successively, as the zinc content is increased, by the /3-phase (body-centered cubic),... 

The /3-alloys are different in nature from the 7-alloys and the a-manganese and /3-manganese structures discussed above, in that they are not complex structures, but are simple, being based upon the body-centered arrangement. /3-Brass, for example, has either a disordered structure, above 480°K, the copper and zinc atoms in essentially equal number being distributed largely at random over the points of a body-centered cubic lattice, or an ordered structure, below 300°K, with copper and zinc at the positions 000 and, respectively, of the cubic unit. Moreover, the physical properties of /3-brass are not those that indicate a filled zone structure. 

Disordered alloys may form when two metals are mixed if both have body-centered cubic structures and if their atomic radii do not differ by much (e.g. K and Rb). The formation of ordered alloys, however, is usually favored at higher temperatures the tendency towards disordered structures increases. Such an arrangement can even be adopted if metals are combined which do not crystallize with body-centered cubic packings themselves, on condition of the appropriate composition. /J-Brass (CuZn) is an example below 300 °C it has a CsCl structure, but between 300 °C and 500 °C a A type transformation takes place resulting in a disordered alloy with a body-centered cubic structure. 

Copper was called cuprum in Latin, hence its symbol, Cu. It is used in the minting of one cent pieces and for pans, but an even more important use is in the wires and switches that carry electricity. Copper is the second-best conductor of electricity (silver is first). It is alloyed with other metals to make bronze and brass. The Cu+2 ion is necessary in the human body, in very small, or trace, amounts, as a catalyst in making blood. At ordinary temperatures, copper is the best conductor of heat. 

The word fume is often misused. As we have seen, it doesn t mean smoke, or vapor, or gas. Strictly speaking, fumes are very fine solid particles floating in the air that have been solidified out of the hot gassy state of a metal or a metal compound. For instance, if you grind zinc or weld brass, some of the metal is heated sufficiently to become a metallic gas. As that gas cools, it condenses into fine fumes that can then be breathed into the body. 

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