The compasses are used for drawing circles and arcs, and come in a variety of sizes to allow the drawing of very small circles in the case of the small compass, and very large circles in the case of the beam compass. The interior of the case has slots fitted to the tools so that there is minimal movement when the case is carried. The dividers are used to quickly compare and transfer measurements, and to divide lines into segments. The function of the case is simply to store and protect the drafting tools, and keep them neat and organized. Drafting plays an important role in manufacturing, engineering, architecture, and cartography.
The replacement parts consist of screws and heads for the compasses and ruling pen.įunctional Description: The purpose of drafting tools is to create precise diagrams which convey how something functions or should be constructed. With these tools come replacement parts carried in capsules. The set includes a large and small compass, a beam compass (with an extension), attachments for the compasses, both a ruling and technical pen, a pair of dividers, and a screwdriver. Though the case is plain and simple, the drafting tools contained inside are intricate and precise. The only markings on the inside of the case are the letters “DS” written in marker on the felt presumably the initials of the original owner. The case only has three words on the outside cover: “Made in Germany”. Repeat with BS on previous FS to "Close the horizon".Physical Description: The drafting set is stored in a simple grey case with a red felt interior. Subtract angle on last pointing on BS from 360, divide by two, add to 1st pointing as "reduced angle". You can also turn "T2 angles" : BS, FS,Flop, FS, BS - All done with upper motion. BS original FS & repeat to "Box the angle". If your error is within spec, you subtract your final angle from 180, and divide diff by 2 to add to angle recorded in 1st pointing. Divide your doubled angle by 2 and compare to 1st Hz you turned. Sight the BS with the angle loaded, then break loose the Upper Hz motion and turn to the FS again.Ĭongrats, you just "Doubled an angle". Then you'd flop, break lose the Lower motion to carry the Hz angle back to the backsight. Ĭhances are you won't be able to mic a perfect zero to backsight with this thing, so you'd load up something close to zero on the micrometer and BS with the lower motion, then break loose the Upper motion and turn to FS, and mic up the Hz angle. This theodolite is going to have Vertical motion and micrometer, Upper horizontal motion and micrometer, and a Lower motion that swings the whole Hz plate. (Transits were open metal plates, had no optical plummet, had 4-screw leveling bases, etc) Yeah, like u/majorkev noted, that is a 30" theodolite, not a transit.
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