engi- of like thickness, superposed and arranged with their We shall now give a few details of construction: neers in the colonies. The cylinders are 32 inches in axesin the same direction, produce the same color un- As the rotary axis of the needle and that of the index der the same circumstances,… … similarly arranged on the mirror of the doubler, they spective angular position of these two parts. Instead and exhaust valves are of the Cornish type, double may be regarded as eighth wave films, as the polarized of being a simple rod, making one piece with the beat equilibrium, two separate…
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