By Samuel Ward Stanton
Изображения американских кораблей 19 века. В основном гражданские, но есть и военные. К каждому кораблю есть небольшое описание. Язык английский.
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Additional resources for American Steam Vessels
A less formal way of expressing this is to state that the display generates a radar picture. 1). Each of these signals, namely trigger, echo signals, heading marker and aerial rotation, has already been mentioned in this chapter when its source was discussed. However, in consolidating an understanding of the mechanics of producing a radar picture it is helpful to summarize them as follows: 1 The trigger. 2). 2 The amplified echoes. Each echo on any given trace produces a brightening of the spot on the cathode ray tube at an elapsed time after the transmission which initiated that trace.
It eliminates the angular wander of the picture due to yaw, while maintaining the heading marker in a substantially (though not exactly) ship’s-head-up position. Inevitably a major alteration of course will become necessary either due to the requirements of collision avoidance or to those of general navigation. 3 vessel is steadied on the new course the orientation, although not meaningless, will have lost its property of being substantially ship’s-head-up. 14). In older systems it was necessary to carry out the realignment by rotating a manual control, but in most modern displays it can be achieved simply by pressing a button.
For the purpose of illustration it is convenient to consider the case of an observing vessel on a steady heading of 000 (T) at a speed of 10 knots through the water in a tide (which is uniform throughout the area) setting 270 (T) at a rate of 4 knots. 15(a)) also shows four targets: (i) Vessel A which is located 7 miles due north of the observing vessel and is stopped in the water heading 045 (T). (ii) Vessel B which is located 8 miles due east of vessel A and is on a steady heading of 270 (T) at a speed of 10 knots through the water.
American Steam Vessels by Samuel Ward Stanton