Bridgman seals

Thus, for a ratio for d/D of 1 2 and for an inner pressure of 1 GPa, the pressure at the window-seat interface is 1.33 GPa and the overpressure which opposes the leak is 333 MPa. In the same way as the Bridgman seals described in Section 1, increasing the pressure will tend to reduce leaks. Another advantage of the Poulter geometry is that the window material is subjected to the hydrostatic pressure it is meant to contain. This enhances its mechanical properties since the elastic coefficients of solids usually increase under high pressures. 

The loaded ampules are evacuated at 250 °C to a pressure of < 10" 3 torr and sealed with an acetylene-Oz burner. The crystals are grown in a Bridgman apparatus as described in detail in the previous General Procedure. 

Large crystals of Rb2[CrCl4] and [N(CH2Ph)H3]2[CrCl4] have been grown the former from the melt by the Bridgman and Czochralski methods, and the latter by careful temperature control from solutions in sealed tubes.252,261... 

Among the objects most susceptible to successful radiographic study are those with well-defined internal structures such as cast bronzes, jewelry, furniture, musical instruments, and ceramics. The variety of materials that have been studied is described in the literature. For example Bridgman reported on the radiography of museum objects (9), Gettens examined Chinese bronzes (iO), Gorelick studied cylinder seals... 

Fig. 1.7 (a) A Bridgman mushroom-type piston seal with a hollow piston stem, and (b) the same, but with the push piece (P) separate from the stem. (From reference 1.)... 

Fig. 1.9 (a) A piston-gland seal (an O-ring with an antiextrusion washer), (b) a Bridgman-type gland seal, and (c) a wedge-type gland seal. (From reference 1.)... 

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