Thin flints

The double prism consists of two similar prisms of flint-glass, each cemented into a metal mount and having a refractive index n, = 1 75 the fluid to be investigated (a few drops) is deposited between the two adjoining inner faces of the prisms in the form of a thin stratum (about 0 15 mm. thick). The former of the two prisms, that farther from the ttelescope (which can be folded up or be removed), serves solely for the purpose of illumination, while the bordw line is formed in the second flint prism. 

Compared to bone material, the composition and structure of flint is much simpler. Flint takes part in the big family of silicon-containing sedimentary rocks. It is basically composed of homogeneous microcrystalline silica grains, which give it a homogeneous macroscopic aspect. The name flint especially defines rocks where the cortex is thin and the heart of the stone is characterised by the absence of calcite. The majority of flint is found dispersed in sediments or as subcontinuous... 

Thin plates and dust of purest gold, in a hard white flint, from the borders of the province of Pannonia in Hungary. 

Fig. 2. Bedrock geology of the basin of Long Island Sound. Contour interval on the rock head is 100 m. Contours below sea level are based on McMaster and Ashraf (1973) and Oldale and Uchupi (1970) above sea level, on Flint (1964). The fall line (FL) is shown by the heavy dashed line. The inferred course of the principal rivers across the bedrock surface is shown by the thin dashed lines. The dash-dot line is the edge of the cuesta of the coastal plain sediments and the Xs mark the course of the river that drained the basin as proposed by Dana (1890). The shaded area is that part of the basin too deep to have been drained by a river after deposition of the coastal plain sediments. 

It is this strain component that is commonly detected by x-ray diffraction observations of thin film deformation. Note that flint refers only to the lattice spacing in a direction parallel to the interface, and that the lattice spacing perpendicular to the interface has a different value. In general, the spacing... 

Franquet T, Muller NL, Lee KS, Oikonomou A, Flint JD (2005b) Pulmonary candidiasis after hematopoietic stem cell transplantation thin-section CT findings. Radiology 236 332-337... 

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