A glass jar with wooden top. To the top is attached a geared stirring mechanism and crank through which two sets of paddles projecting within the jar can be caused to turn in opposite directions. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Press of wood construction, with worm and rack of brass. Faintly inked "American Philosophical Society. Given by Francis Dacosta, May 21, 1819."

Wooden model of white pine and mahogany with steel cutter. A large wheel that rolls along the ground has an integral pulley, through which it drives a vertical shaft having a four-bladed cutter at its lower end. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Model of a fireplace and tall chimney. The fireplace has a sliding mantel door and is decorated in black ink with leaf boughs, architectural details, and an illegible genre scene at the top center. Above the fireplace mantel, on the front of the chimney, is an overmantel landscape and two round, rotating vents. Both the fireplace and overmantel are composed of brown paper, while the rest of the fireplace and chimney are covered with blue paper. There is a small hole in the bottom left corner of the fireplace, and a metal eyehole screw in the bottom right corner. At the top of the chimney is a small metal pipe and a damper, which can be opened and closed with a lever accessible inside the hearth. "No. 4" is inscribed at the top of the chimney. Unsigned and undated.

Model of a fireplace with a sliding mantel door. It is covered in brown paper and decorated with black ink with architectural details, faux marbling, and a leaf bough on top center of mantel. There are square holes in each of the four corners of the fireplace. A damper is inside the top of the chimney, which can be opened and closed with a lever accessible inside the hearth. "N. 1" is inscribed within the ink semi-circle at the top of the chimney. There is a small hole in the bottom reverse of the model, labeled "C." Unsigned and undated.

One of two 1796-1797 stove models by or attributed to "Oeconomy." Wood model of stove set in rectangular chinmey niche. Covered in blue paper with "E" written on paper and affixed to chimney of stove. Metal hook above "E." Open metal door reveals inside of stove. Unsigned and undated.

One of two 1796-1797 stove models by or attributed to "Oeconomy." Wood model of stove set in rectangular chimney niche. Covered in blue paper. Stove opening covered by semicircular metal. Unsigned and undated.

Complex wood model of fireplace combined with hearth. Oven is above fireplace and an incomplete tin stovepipe is above the hearth. Metal mechanism to lift flue sticking out of left portion of model. Covered in blue paper.

Wood and cardboard model of stove. Three levels, including an upper chamber, probably for hot air, as well as the fire and ash boxes. There is no communication between the three chambers, nor between them and the double chimney consisting of two concentric flues. All walls are double. Two wire pulls. Side and top are labeled "Presented 3 November 1797" in handwritten ink. Two red seals are affixed to top of box, with monogram "AC."

Steel and cast-iron model of a locomotive firebox supported by a frame, to which is also attached a pair of locomotive wheels, eccentric, and actuating mechanism. Unmarked.

A model constructed of wood and wire. An axle on a wooden base carries a conventional piston pump at one end and the remains of a rudimentary paddle-wheel at the other. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Truncated pyramid of mahogany, consisting of two identical interlocking halves. There is an oval aperture on the top, and holes at the bottom on all four sides. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Mahogany model consisting of an open frame 18" high, enclosing three other telescoping frames of similar length, capable of extending to 73." Each frame is slotted to fit those contained within it. A windlass at the base operates the elevator through simple pulleys. The base has folding projections to increase the effective base area. Unmarked. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

White pine model of a gate-frame, with a long wooden plug valve across the bottom. Marked with a contemporary inked inscription "Model of a Rolling-draw Gate presented by Nathan Sellers 19 April 1811." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Wooden frame with brass gearing, pulleys, and weight, the latter apparently filled with lead. The machine is to be operated by four men through a double-crank windlass. The weight is released automatically by a hook-release bar at the top. The windlass has the remains of what may have been a ratchet for the protection of the operators against the sudden release of tension. Unmarked. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).

Simple wooden model of a press, hand operated through a toggle. Ratchet on side

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).

Elegantly made brass-bound wooden box with inlaid top. The top and bottom fold out to form a writing table. An integral frame supports two writing pens. A brass plate is inscribed, "Hawkins' Patent Polygraph, Manufactured and Sold by I.H. Farthing, No. 43, Cornhill, London. No. 282." (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).

A hollow white pine model, exhibiting a paddle system. One side carries eight paddles on an endless chain. One of the two sprockets carrying this chain extends through the model to a wooden lever on the other side. Through this lever the movement of the paddle-chain can be demonstrated. Unmarked. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).