Parallel bar grids are particularly useful for obtaining information from sequential ribbons of sections. Parallel and Rectangular Mesh Grids (available from GILDER, Graticules Optics, VECO)
Bar/hole width change with increasing mesh repeat. Square Mesh (available from GILDER, Graticules Optics, VECO, (coated grids)) As a general guide the lower the mesh repeat, the thicker the grid (50Mesh: 25µm, +/- 5µm 600Mesh: 6µm, +/- 2µm). Gilder grid thickness varies with the mesh repeat.All Graticules Optics grids are approximately 15-25µm thickness, with the exception of stainless steel which is 12µm and titanium which is 15µm.Handle, Rim tab: Some grid types are available with handle (Graticules Optics, VECO) or a rim tab (Gilder) for a better handling. Rim mark: An asymmetrical mark in the rim allows for precise orientation of the grid, and aids in the identification of each side. Older grids have a ‘reverse arrow’ center marking to distinguish each half of the grid. Most of the grid types are available with a center and/or rim mark.Ĭenter mark: Many grids have an asymmetrical center marking, enabling the four quadrants of the grid to be distinguished.
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