Small leather-covered wooden box containing ten brass weights. Each weight is inscribed with letters and numbers. A slide covers a collection of ten (originally twelve) smaller silver weights, the largest of which is marked 128. Paper label on front of box labeled "German weights for coins".

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).

Two blocks of wood, hinged to be closed for carrying. A compass is set in the lower block. Both blocks are scaled to the gnomon which is a thread extending diagonally between them. The cover block has on its exterior surface a rotatable wooden disc with pointer and scale. Marked with tables and scales in Chinese script. Down the sides of the dial are 13 holes for setting the angle of the lunar dial. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

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."

Brass instrument on wooden stand. Inscription on brass says "Pixii, Neveu et Succeur de Dumotiez a Paris." Paper label on base says "The property of Dr. Hare value [?] Smithsonian."

Ten-pound precision balance in brass. Ivory balance indicators are mounted on columns of the supporting frame. The pans are supported by rigid rods suspended from the balance arm.

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

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).

This ship's log consists of a vertical-turned brass rod with a slot in the top for a pulley or fulcrum which is missing. A pair of shorter rods support between them a pivoted brass quadrant which is scaled but not numbered. The base is scaled radially from the axis of the quadrant. Inscribed "Porters A Conno(e)r" on the base. Paper on underside label marked "Porter Constant Log." (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.

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.

A black walnut box containing two measuring tubes; one with 1 1/4" diameter screen disc and 5" long tube and one with 6" screen disc and 2 3/4" long tube. This is an experimental instrument fabricated of discs of bronze or brass screen, attached to a brass tubing to constitute an anemometer. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Brass instrument. In a box labeled, "J.H. Onderdewyngaart, Canzius a Delft. La Fabrique des instruments de physique et de mathematique a Delft." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Brass circular box of 3" diameter, 1 3/4" high, into which is built a sextant. Unmarked.