Brass triangular base 10 1/2" wide, with three leveling screws and two spirit levels. Upon it a vertical stands carries a triangular frame pivoted at the base. Its long arm carries an adjustable, threaded contact screw. The arm at right angle to this is acted upon by a cam mounted on the stand. Movement of the cam causes a hand to move over a scale from 0 to 220, and the contact screw to rise vertically one inch per 100 divisions. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Octant housed in original wooden box. Octant made of limbs of ebony, scales of ivory. Nameplate on crossbar reads "Spence Browning & Rust London." Wood case has felt lining, metal hook and eye, and lock.

Cast plaster, life-sized bust of elderly man with curls above each ear. Elaborate drapery around the shoulders. Bust stands on a cast-in cylindrical columnar support. Incised on back of base: "CLINTON" (formerly attributed as De Witt Clinton).

Inscribed: "To the Rt. Honorable Sir Joseph Banks, Bart., President of the Royal Society, this new British terrestrial globe containing all the latest discoveries and communications from the most correct and authentic observations and surveys to the year 1799 by Capn Cook and more recent navigators. Engraved from an accurate drawing by Mr. Arrowsmith, Geographer, is respectfully dedicated by His most obedient serven Wm. H. [partially obliterated] Bardin." Also affixed with a paper tag, "Sold by W. & S. Jones, Holborn, London." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Brass construction. The instrument consists of a plate supported by an L-shaped arm and foot. A thumbscrew on the plate causes a pencil below to describe the figure, through a train of four gears, the last of which carries the pencil at the end of an arm. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Plaster model labeled "Mont Blanc en relief." Painted green and grey and carrying numbers evidently related to a key which is now lost. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Three-quarter-length seated figure turned left, head resting on left hand, right hand holding manuscripts. The sitter wears a black coat and waistcoat and a white shirt. There is a red table cloth at lower right, under manuscript. Gray-brown background. Signed: "D. Huntington/1861" on lower right corner.

Marked "Tho. Heath Londini Fecit." 19" telescope, mounted on 4" vertical and horizontal circles. On tripod. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Pine case without embellishment. The dial is 10 5/8" diameter, probably of cold silvered brass. Unmarked. Heavy brass plates with a pillar at each of the four corners contain the deadbeat escapement and going train of two many-toothed wheels. The motion work is between the dial and front plate. A small gear on the #2 gear arbor drives a large gear carrying the minute hand. The hour hand is driven by the latter gear through a compound idler gear and pinion. The second hand is mounted on the escape wheel arbor. The pendulum vibrates seconds and is mercury compensated. It is in two pieces connected by a yoke, and suspended by two springs. A thermometer is mounted on the back of the case. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Plaster model of a three-dimensional surface. The printed inscription reads, "Model of the magnetic surface presented in the discussion Part II of the magnetic observations made at the Girard College Philadelphia between 1840 and 1845, by Prof. A.D. Bache. Const. and modeled by Ferdinand Engel, Washington, D.C. 1862." A handwritten description reads, "Presented by A.D. Bache." The observations which this model records are described in a 36-page pamphlet published by the Smithsonian Institution in 1863. A note with the model states that Bache intended to make two more models of the horizontal and vertical forces; one of these is now at the Smithsonian.

Brass instrument, with horizontal dial with a 5 3/8" needle and scale from 0 to 110. The needle is mounted on a vertical spindle about 5" long. The spindle is mounted on bearings at top and bottom, the latter being a needle in the center of a mica disc. A fine spiral spring extends over 4" of the spindle, and is attached to it at the bottom and to the frame at the top. The spindle and spring are covered by a brass housing which can be pulled off. Instrument has ill-fitting top which may not be original. Top is inscribed with "S. Homer May 27 1863" and "Samuel Homer Aug 27 1863."

Nine instruments housed in original wooden case covered in leather or sharkskin. The top of the case is hinged at one side, and held shut by a snap fastening. Inside the top is a printed label: "McAllister & Co./48 Chestnut Street/Philadelphia. Have constantly for sale, cases of/Mathematical Instruments/For Schools, Wholesale & Retail/Dividers, Gunter's Scales, Parallel Rules, Brass and Ivory Protractors, etc. separate from the case." Around the wall of the top is pasted a strip of paper, bearing handwritten inscriptions - "$3 1/4 /N60K/n fli/gfi DW Mr/ No 160-9/str purchd March 18 1847/of McAllister." Contains nine drafting instruments: divider, compass with five attachments, ivory scale, parallel rule, and scaled semicircle.

Brass variation transit (magnetometer), in oak box. Instrument has two telescope assemblies.

Marked "Potts and Rittenhouse." 6" compass set in 13 3/4" sighting arm with sights 6 1/4" high. On walnut tripod. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Incomplete theodolite. Two fixed sight vanes are mounted to the horizontal circle, which is attached to the tripod assembly through the socket. Rotating compass and alidade with vernier blades in center. Signed "B. Chandlee Nottingham" along outer circle. Analysis of the alidade by a Scanning Electron Microscope in 2007 revealed that it contained silicon, most likely originating from a mixture of silicon bronze, a product that was not developed until the late 19th to early 20th century. Therefore, the alidade is not original to the piece.

Brass compass with a variation arc on the north arm, and a level vial on the south arm. Signed "T. Whitney / Maker / Philadelphia" on compass face. The instrument is dated "1814" under socket. It is in its original condition, with the exception of the Jacob's Staff attachment screw, which was added at a later date.

Brass sextant marked "Stancliffe, Maker, Philadelphia." 8" radius. Scaled 0-155, in 1/2 degrees. There are two interchangeable telescopic sights, and the micrometer is read with a microscope. The instrument is boxed and has a leather carrying case. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Seated figure in a Chippendale-style chair is shown to below the waist, his body turned to the left. The subject's hands are crossed on the table in front of him and he holds a red pencil in his right hand, with which he gestures at notepaper with a diagram. His hair and eyes are gray and he has a rosy complexion. The subject wears a brocade banyan with rose lining, a white, buttoned waistcoat, and a white neckcloth, collar, and ruffle. The background is a shaded, greenish-gray. Unsigned and undated.

Brass sundial with three adjustable legs and two levels attached to the side. Engraved along perimeter of top of compass: "Paris 49 Londres 51 St Petersbourg 59 Madrid 41 Milan 45", along with sundial's numerical position. Engraved on underside of compass: "Lisbonne 42 Constantinople 41 Berlin 52 Vienne 48 Hambourg 53."

Mahogany block with inset compass and cover. Possibly contemporary inked inscription, "Belonging to the globes presented by W. & S. Jones, 18 April 1800." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).