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K&E
#5613 Pocket Compass
To see various Vintage surveying instruments by well known
makers such as
A Brief History Surveyors and the instruments they used played an important part in the development and history
The earliest instruments used for surveying prior to the development of compasses included devices such as circumfertentors, quadrants and sextants whose origins and use are most commonly associated with maritime navigation. There was a need for more precision as well as portability and for these devices to be able to be used in the field. What generally became known as survey compasses, an example of which is pictured just above, became the standard for day to day use here in America. Surveying Compasses developed and evolved over
time. The earliest American examples were made of either brass or primitive wooden
bodied surveying compasses dating from the colonial era
t More complex and job specific compasses such as Mining Compasses came with provisions for auxiliary scopes for mining applications or to allow for shooting of angles in field use. (See example to right) Solar Compasses were developed in order to allow the operator or surveyor to better determine his location by using the sun and horizon as reference points. Different variations on these themes were developed and offered by different makers as these designs evolved and each company or maker offered their own version. These later job specific Surveying compasses were offered by manufactures like William Young, Gurley, and Keuffel & Esser Buff, Berger, Warren & Knight as well as many others. These well known names represent the larger makers but many examples by smaller and not as well known makers who had ideas and products to offer the marketplace are known. Surveying Compasses The first instruments used to explore, survey and divide
up America came with the early settlers and explorers
from
These earliest makers included Anthony Lamb and Thomas
Briggs of New York, and Aaron Breed of
Early Wooden Surveying Compasses by colonial era makers
are becoming ever more difficult to
The list of individual makers of all forms of surveying instruments continued to grow along with America throughout the 19th century. The major makers continued to be concentrated in or near the major cities and hubs of activity, but the list of maker from other areas began to grow with people setting up shops in places like Western PA, different parts of Ohio, Maryland, Virginia, and elsewhere. Saint Louis also became a center of activity with its strategic local and jumping off point on the Mississippi River for the trek west. The first and best known California makers of surveying instruments were Schmolz of San Francisco, followed by John Roach who moved there from New York after a partnership with Warner in the mid 1800's and finally Joseph Sala who took over the Roach business after his death. The list and examples known number in the many hundreds and there is a comprehensive although not complete list of known makers and examples of their instruments documented and pictured at the Virtual Museum of Surveying compass makers directory which can be found here. http://www.surveyhistory.org/compass maker directory.htm Surveying Transits and Theodilites The next major step in the evolution of surveying
instruments made in America is attributed to William
Transits and Theodilites are basically a further improvement over the surveyors compass which was also offered with a scope as an accessory. The major difference being that the scope was fixed over the compass and it was offered as a single unit. The earliest transits did not have the ability for the scope to be revolved on its axis ---- to shoot behind it as well without turning the whole instrument 180 degrees. This was due partly to the quality of the optics available necessitating longer scopes and partly to the basic idea simply was not thought of or employed in the initial design. Over the years, these attributes were incorporated into the transits design without fanfare. Originally instruments that were not able to revolve on their axis were designated as theodilites, but over time the use of this word was changed or expanded to include more precise instruments that not only had this ability but were so intricate and precise that small magnifiers were needed to insure proper recording of what the scales indicated. As with compasses, transit were offered in different designations according to size or function. Some transits were offered without compasses under the scope at all and were used for simple layouts or laying of straight lines and are typically referred to as Builders transits. The vertical vernier found on some transits was offered in different sizes and configurations for different applications and many transits did not utilize them at all. Transits could be ordered in many sizes and different configurations leading to a myriad of differences that can be encountered even in models carrying the same model number from makers like K & E or Gurley. Our interests in buying and selling of antique
surveying instruments is focused on more complex During this period during the mid to late 19th
century many different surveying
instrument makers came onto the scene and entered the
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