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45 degrees adaptor adjustable base Adjustable Support Adjustment of Surveying adjustment shaft Alignment APPROVAL arranging the collimator author wishes bolts brass inset brought into coincidance catalog number center post central instrument checked circle graduations Civil Engineering Department collimator set-up Design and Construction device eight threads error process fits fixed focus when arranging hole horizontal plane infin infinite focus jective lateral adjustment knob level back leveling screws light rays limator line-of-sight lines of collimation mounted objective lens outdoor parallel rays pipe cover placed precise level problem proper elevation provide a means raise or lower receive the threads receptacle repairing surveying instruments reticle rigid short focus sliding the level standard three inch supporting pipe targets tested thesis threaded brass threads per inch three inch diameter transit is set trapezoidally shaped piece trial and error UNIVERSITY OF WISCONSIN vertical adjustment vertical cross-hair vertical plane vertical shaft vibration whole field wye level telescope