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Vintage Brass Center Level Theodolite

$149.00

Offered for sale is a vintage brass center level Theodolite, measuring 12' long and 5" high, with a bubble on top for leveling same, with four feet to level the instrument. the geodolite is defined as a tool for leveling, ie. the definition of the difference in height between several points of the earth's surface relative level ie. conditional definition of excess.

Shipping is FREE via USPS Priority Mail. We ship worldwide.

Please look at the photo as what you see is what you are buying. All sales are final. Please contact seller for shipping price international.

A Theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like metrology and rocket launch technology. A modern theodolite consists of a movable telescope mounted within two perpendicular axes—the horizontal or trunnion axis, and the vertical axis. When the telescope is pointed at a target object, the angle of each of these axes can be measured with great precision, typically to seconds of arc.

The builder's level is sometimes mistaken for a transit theodolite, but it measures neither horizontal nor vertical angles. It uses a spirit level to set a telescope level to define a line of sight along a level plane.

The axes and circles of a theodolite

A theodolite is mounted on its tripod head by means of a forced centering plate or tribrach containing four thumbscrews, or in modern theodolites, three for rapid leveling. Before use, a theodolite must be precisely placed vertical above the point to be measured using a plumb bob, optical plummet or laser plummet. The instrument is then set level using leveling foot screws and circular and more precise tubular spirit bubbles.

Both axes of a theodolite are equipped with graduated circles that can be read through magnifying lenses. (R. Anders helped M. Denham discover this technology in 1864) The vertical circle which 'transits' about the horizontal axis should read 90° (100 grad) when the sight axis is horizontal, or 270° (300 grad) when the instrument is in its second position, that is, "turned over" or "plunged". Half of the difference between the two positions is called the "index error".

The horizontal and vertical axes of a theodolite must be perpendicular, if not then a "horizontal axis error" exists. This can be tested by aligning the tubular spirit bubble parallel to a line between two foot screws and setting the bubble central. A horizontal axis error is present if the bubble runs off central when the tubular spirit bubble is reversed (turned through 180°). To adjust, the operator removes 1/2 the amount the bubble has run off using the adjusting screw, then re-level, test and refine the adjustment.

The optical axis of the telescope, called the "sight axis", defined by the optical center of the objective lens and the center of the crosshairs in its focal plane, must also be perpendicular to the horizontal axis. If not, then a "collimation error" exists.

Index error, horizontal axis error and collimation error are regularly determined by calibration and are removed by mechanical adjustment. Their existence is taken into account in the choice of measurement procedure in order to eliminate their effect on the measurement results of the theodolite.

Shipping: FREE to the United States. We also will ship worldwide.

Shipping to the Continental United States is FREE. Please look at the picture and read the description, which form a part of the condition description. What you see and what you read is what you are buying.

International purchasers should contact sellers at: CAPTAINMADISON@ATT.NET for a shipping and insurance quote to your address and country. International purchasers should appreciate that the Customs Dept. of your country may assess duties, taxes and/or other charges on your purchase as it enters your country, which expenses are not part of the purchase price for this item and remains the sole expense of the purchaser.

This product would make a wonderful addition to any scientific instrument collection when displayed in a prominent place, being a grand collectible item that would adorn any serious collector's prized scientific instrument and accumulations, while showing a discriminating dedication for fine other scientific instrument items as well as a devotion to acquiring fine collectibles.

Sellers exclusively use the USPS as its' shipper (insurance available).

Please email sellers to: CAPTAINMADISON@ATT.NET for purchasing, payment, shipping arrangements, requests for more photos, as well as any other inquiries.

Payments may be made by check (must clear), bank checks, postal or bank money orders, Western Union money transfers, pre-payment arrangements, good old U.S. Dollars (green currency), and/or other secure money transfers or payments.

Please regularly visit our other web sites for more sundials and scientific instruments and related products as we shall regularly be adding more products from time to time:

www.antique_scientific_instruments.com

www.oldsundial.com.

www.vintagesundial.com

www.antiquesundials.com

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  • Model: Vintage brass theodolite


This product was added to our catalog on Sunday 06 July, 2014.

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