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Total Results: 152

Kemmerer and Releated Items
Water sampling kit including a kemmerer. The Kemmerer, also known as a water bottle is used by lowering it to the desired depth of water to be tested. A messenger (torpedo-like object with slit on the side) is attached to the rope holding kemmerer and slides down to it. It hits the kemmerer and clos...
Location: Reston, VA, USA

Kemmerer and Releated Items (3 of 4)
Water sampling kit including a kemmerer. The Kemmerer, also known as a water bottle is used by lowering it to the desired depth of water to be tested. A messenger (torpedo-like object with slit on the side) is attached to the rope holding kemmerer and slides down to it. It hits the kemmerer and clos...
Location: Reston, VA, USA

Kemmerer and Releated Items (4 of 4)
Water sampling kit including a kemmerer. The Kemmerer, also known as a water bottle is used by lowering it to the desired depth of water to be tested. A messenger (torpedo-like object with slit on the side) is attached to the rope holding kemmerer and slides down to it. It hits the kemmerer and clos...
Location: Reston, VA, USA

High Standard Alidade
This alidade consists of straightedges with a rigidly-mounted telescope that can be rotated through the vertical angle ±30. The telescope is set on a high standard or post (4 inches in height) to raise it above the table. The telescope for the high standard is 16 power, inverting type with internal ...
Location: USA

Gurley Micrometer Alidade
Manufactured by W. & L.E. Gurley, Troy, New York. The micrometer attachment us a modification of the tangent screw attached to the horizontal axis of the telescope and used for measuring vertical angles in terms of their tangents. Relatively few of these types of alidades are listed in early 1900s p...
Location: USA

Pendulum Self-leveling Alidade
This is a telescopic alidade in which a pendulum device, or compensator replaces the conventional bubble for establishing a horizontal reference line from which vertical angles may be measured. Alidades were the primary mapping instrument in the U.S. from about 1865 to the 1980s, when they were repl...
Location: USA

Explorer's Alidade
Manufactured by Keuffel & Esser, New York & New Jersey. In this type of alidade, as opposed to the high standard, the telescope mounted close to the straightedge, producing a more compact instrument. A right-angle prism is attached to the eyepiece and permits viewing by looking down. A cylindrical b...
Location: USA

Telescopic Alidade
A high standard alidade; this type of alidade permits direct viewing through the telescope. The level is mounted below the inverting telescope and the base (blade) is solid brass with circular voids. Manufactured by Keuffel & Esser, New York & New Jersey. Object ID: USGS-000165...
Location: USA

Drafting Set
Also known as a drawing set, the instruments were used in cartographic work. The instruments include ruling pens and ring head dividers. This set was manufactured by Eugene Dietzgen & Company, Chicago and New York. The set was used by the U.S. Geological Survey Topographic Branch in the early decade...
Location: USA

Rigid Graver with Loupe
Gravers were used in cartographic work by the U.S. Geological Survey Topographic Branch. Graver types include rigid, swivel, building and fine line. Object ID: USGS-000178...
Location: USA

Cast Bronze Benchmark
Benchmarks can be divided into two general groups: the "vertical control points" are points that mark a very precise elevation above the standard datum plane (usually referred to as elevation above sea level) and the "horizontal control points" are points with precisely established latitude and long...
Location: USA

Stereoscope used in Photogrammetry
Stereoscopy, stereoscopic imaging or 3-D (three-dimensional) imaging is any technique capable of producing three-dimensional visual information or creating the illusion of depth in an image. This apparatus was manufactured by Oculus. Object ID: USGS-000192...
Location: USA

Argus Film Projector
Manufactured by Argus Inc, Ann Arbor, Michigan. This projector was used for 35mm slides. Object ID: USGS-000194...
Location: USA

T21 Theodolite
Manufactured by WILD Heerbrugg, Switzerland. This instrument was made in the late 1950s- early 1960s and was in service until the late 1970s. It includes its original air-tight and water-tight steel case, as well as its shipping case. Object ID: USGS-000198...
Location: USA

Tagged Marker Stake
Used in U.S. Geological Survey field work. Object ID: USGS-000209...
Location: USA

Plane Table with Tripod
Plane tables are also known as drawing boards. The round leg tripod is made from hardwood, with a bronze head, steel tips and plum bob. Object ID: USGS-000210...
Location: USA

Split-leg Tripod (Plane Table Base)
Constructed of maple with cast bronze Johnson Head, leather strap, cast steel shoes and attached hooks (probably not original). This tripod is about 50-1/2" in height (closed) and is nearly identical to another tripod in the USGS Collection (USGS-492)....
Location: USA

Leather Boots
The soles of made of heavy-duty rubber with metal studs. Object ID: USGS-000212...
Location: USA

Canvas Plane Table Case
Used in field work by Thomas B. Nolan, who served as the seventh Director of the U.S. Geological Survey (1956-1965). Object ID: USGS-000214...
Location: USA

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