Knight Optical offer a range of Stock N-BK7 Precision Grade Windows, for use with our Graticules. Graticules are manufactured by photolithographically printing a highly accurate pattern onto a glass ...
A MICEOSCOPE for measuring small lengths has recently been put on the market by Messrs. W. Ottway and Co., Ltd., Orion Works, Baling, W.5. The microscope, which gives a magnification of 25, is about 6 ...
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