Leitz 115A Transit

© Brooke Clarke


Small & Large photos

Background

This is similar, if not the same as, the transit I used in a college surveying course.  This Leitz model 115A (now Sokkia 7327-60)  is speced for 1 minute horizontal angle measurements and 5 minute vertical angle measurements in a single reading.  By turning the same angle three times with the scope normal and then 3 more timew with the scope inverted the accuracy will be improved.  When this is done the final reading is 6 times the actual reading and when the total reading is divided by 6 the resulting reading will have about squareroot (6) more accuracy.  Inverting the scope also removes some of the errors in the transit.  The ability of invert the scope is one of the main advantages of a transit when compared to other instruments.

The image is right side up and the Stadia constant is 1:100 with a zero adder.
Uses the older 3½" x 8 thread tripod

The carrying case holds the transit and:

The 115 has 4 leveling screws and the 116 has 3.  I don't know what the 'A' in the model number means.
Note that a 3 screw leveling mechanism will change the Height of Instrument (HI) as the instrument is leveled but a 4 screw instrument will not.  So in a precision leveling operation you do not want to tweek the level if you are using a 3 screw instrument.

Rod

To go with the trtansit I have a Leitz three piece fiberglass rod which when collapeed is 54" long & when extended is 11 feet tall.
U.S. patent 4318228   Leveling pole March 9, 1982 Class 33/809; 33/296
The lines on the rod have beveled  ends so each edge of a line can be read to 0.1" of elevation.

Care and adjustment of K&E Surveying Instruments

This brochure has a lot of information on the 215 including lubrication, disassembly and use of stadia, etc.
see the bottom of my Leroy Lettering set page for ordering instructions.
   

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