… for example, projectors which project magnifications of varying degree on to an optically flat surface to permit a … “Frames” may be examined singly or continuously at varying numbers of frames per second. On the other hand …
… liquids, wood tar and wood charcoal in proportions varying according to the nature of the wood employed and the … containing 70 to 90 % methanol (methyl alcohol) with varying proportions of acetone and other ketones (generally …
