Pictorial design diagrams, or pictorial circuit diagrams are basically the same thing with the exact same function, but they use pictures of components inside the circuit instead of symbols. Again, here's the exact identical precise circuit (almost except a control transformer was inserted and they're utilizing conductors L1 and L3 rather than L1 and L2.
A design diagram refers to a specific type of circuit design that utilizes standard electrical/electronic symbols instead of images to show how a circuit (or portion of it) works. Below is a typical 3-wire motor control circuit employing a normal momentary stop - start pushbutton channel employing a schematic diagram. (Momentary this means that the button/switch you activate will go back to its default position once you physically let go of it, usually by a spring which forces the button/switch to do this.)
Following is a variant of a diagram. The main point of this diagram is to show the logic (speaking to electric management ) of a circuit board. This diagram is the one that I mainly come across in my line of work, and it is extremely successful for troubleshooting issues or learning how a circuit works. Some circuits are so huge that most types of schematic diagrams need to be read in increments from book form (normally with coded numbers so that information can be easier found). Again, here's the identical specific circuit as the first two weeks, but looking at it in ladder form.
Here's another schematic diagram demonstrating the same circuit, connections and components and it looks different but they both fall into precisely the identical category.
Right, much less mess? I have enough info in all of these diagrams to know exactly what this circuit will do and where to start looking for problems. Hope this helps. ( Note: do not confuse circuit or schematic diagrams together with wiring diagrams; wiring diagrams will typically show pictures of components such as the pictorial, and the way the entire or part of a circuit is wired. The difference is that wiring diagrams usually put an emphasis on actual physical location of necessary elements relative to each other that essentially tell a layman exactly what to do about the wiring)
Think of it in this way; a circuit structure is any sort of diagram that illustrates how a circuit functions where the most important purpose is that the proper wiring of elements and their relationship to each other instead of physical place relative to one another or planning prototypes. Nonetheless, in some applications Assessing diagrams can be difficult so accept this as general information. I have discovered this is particularly true when working with much more complex circuits and electronics. I'm going to use a simpler but typical industrial circuit since these circuit set ups are the exact same, but nevertheless where it is possible to observe how each sort of diagram shows the function of the circuit in their own ways.