Portable universal respiration apparatus, according to specifications from Professor Francis Gano Benedict.

B 181. Automatic, for gas heating, coal or wood firing.
B 183. Fully automatic, with copper interior and steam heating.

Fig. 197: Wooden frame of dragon set piece.
Fig. 198: Disposition of pyrotechnics in the dragon frame.
Fig. 199: Outward appearance of dragon set piece.

Iron gas burner for the production of small glassworks; ball and socket rotatable neck; two flame adjustment knobs; three-pronged foot. Adjusting the two knobs on the burner allows for the user to dial in the exact…

An icon of experimental chemistry, as well as a standard piece of equipment in scientific laboratories and high school classrooms alike, the Bunsen burner was built in 1854 by Peter Desaga, an assistant in German…

An icon of experimental chemistry, as well as a standard piece of equipment in scientific laboratories and high school classrooms alike, the Bunsen burner was built in 1854 by Peter Desaga, an assistant in German…

Meeker burners function the exact same way as Bunsen burners except that they are used for objects that require a wider flame base. The Meeker burner can produce more heat than a Bunsen burner and features a distinctive…

Meeker burners function the exact same way as Bunsen burners except that they are used for objects that require a wider flame base. The Meeker burner can produce more heat than a Bunsen burner and features a distinctive…

Rectangular wooden case with sloped top; black instrument panel on top surface; instrument panel features six connection posts for the external generator, a galvanometer meter under glass, nine black plastic knobs, four…

Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to…

Wooden box with black metal instrument panel; four padded metal feet on bottom; leather handle attached to side with two nickel connectors; nickel lock on side of base and lid; lid connects to base via two coated metal…

Six volt galvanometer in a rectangular wooden case with rubber feet. A brass lever at the top of the case provides coarse zero adjustment; two black plastic and metal knobs on the right side of the case provide fine…

Hardwood case with a leather handle and metal hinges and clasp; aluminium interior instrument panel has black finish; instructions on paper are inside the lid; the instrument panel features four black plastic knobs, two…

Finished wooden box; four metal feet on bottom (box must be set on its side for instrument to function); top of box has two brass holders for missing handle and metal strip; side lifts up half way exposing a painted…

Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

Tall rectangular wooden base with black plastic instrument panel; instrument panel is attached to base via four metal screws, two on each side; two small black plastic knobs that adjust up and down as they are turned…

Wooden box with no lid; black painted metal instrument panel on top; engraved writing on top left corner; two metal knobs projecting from panel on upper right side most likely for running electrical current;…

Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…

Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…

Rectangular wooden box; brown leather handle attached to top with metal fasteners; front has a steel lock screwed to it; lock is stamped with manufacturer; four hard black rubber feet on bottom; top attached with two…

Direct current voltmeter, Model 1. Instrument mounted on brown felt on a hardwood base, with a brass tag in front; instrument made of metal and finished in orange-brown; two electrical connections covered in black…

Rectangular wooden apparatus for holding fifteen test tubes upright. Heavy tape has been attached to all four sides.

Wooden apparatus for holding five test tubes upright.

Wooden apparatus for holding twelve test tubes upright.