Hi Everyone, I send this link to Killivien Sithole, so he could see a Dumpy Level, it is very good collection of Surveying equipment and Instruments, that i like to place it where everyone can see it.
So here is the link,to New South Wales University Instrument Collection. I will also give there
Professors Web site Jinling Wang , Associate Professor, Surveying and Geospatial Engineering, in the School of Civil and Environmental Engineering, Faculty of Engineering, University of New South Wales. This website provides some information on his research, teaching.
Instrument Collection , Arrows Left and Right
http://www.sage.unsw.edu.au/currentstudents/ug/projects/f_pall/html/l1.html
Professor Jinling Wang's website .
Replies
This level has to go down in the records,this is made in 1924,Kudos to them. Instrument 0302,
The Watts precise level.This tilting level by E. R. Watts & Son Ltd.
"The telescope is of 21 inch (533 mm) focal length with a clear aperture of 2.5 inch (63.5 mm), and is fitted with two eyepieces which give magnifications of 45 and 65 diameters respectively. With this instrument, 0.01 foot (3 mm) can be read at a distance of 1600 feet (488 m) or more, according to atmospheric conditions."
What a Treasure.
This precise level by Watts can be supplied with a parallel plate micrometer, as shown in the black-and-white figure. The readings of the micrometer are taken on a graduated arc fitted at the objective end of the telescope. The graduations are in thousands of a foot (0.3 mm) . Estimation to 0.0001 foot (0.03 mm) is possible,