In these the walls and floors are imagined to have been removed showing only the boilers, tanks, radiators, etc., with the connecting pipe lines all in the proper relation to each other. Such drawings are found useful to the architect in making pictorial diagrams of piping systems, etc., where artistic appearance is not a factor. This system then is used where approximate pictorial effect is desired together with the advantage of measuring distances directly on the picture. ![]() Although the ability to measure distances on this kind of a picture is gained, there is somewhat of a loss in pictorial value, as the Isometric drawing does not show the object exactly as seen by the eye of the observer. To supply this need of an easily made picture upon which parts may be measured directly, we have a system of drawing called Isometric Drawing. This can not be done on a perspective as most of the distances are more or less distorted as has already been seen. ![]() ![]() ![]() While perspective projection is the method of pictorial representation generally used by the architectural draftsman, he sometimes finds it desirable to draw a quick mechanical picture on which he can measure most distances directly.
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