Scientific Instruments Collection<br />Electrical Engineering Instr. #7<br /><br />five small, cylindrical vacuum tubes of various sizes; the three smallest are mostly made of glass, while the two larger tubes are comprised partially of black plastic or metal material; per label that was previously displayed in the case by the EE dept: "Before the invention of the transistor, vacuum tubes were the basis of essentially all electronic devices."
Scientific Instruments Collection<br />Electrical Engineering Instr. #1<br /><br />bi-anode, cold cathode Gundelach-type x-ray tube; clear glass, large-sized sphere connected to a long arm that extends to the "cathode"; the "anode" is the shorter arm at the opposite end; the "anti-cathode" arm is at a 45 degree angle; a fourth and smallest arm is at a right angle to the cathode arm; diagram and PDFs in files
Scientific Instruments Collection<br />Electrical Engineering Instr. #2<br /><br />large, purple-tinted, transparent glass "tube" with a large-sized sphere and two narrow "arms" on either side; one arm is the "cathode" arm (with terminal that looks like the bottom of a light bulb); the other is the "anode" arm; these arms are secured by leather and metal straps to the wooden display stand; this is a high-vacuum tube; the purple tint indicates the presence of potassium in the glass
Scientific Instruments Collection<br />Electrical Engineering Instr. #3<br /><br />compact instrument with several dials and thumb screws housed in a latched wooden case with leather handle; per company ad: "can be used in bond testing, or to measure switch or contact resistance, or fractional ohm standards or in quantitative analysis. The circuit of the instrument is an adaptation of the potentiometric method of low resistance measurement" (see notes)
Scientific Instruments Collection<br />Chemistry Instr. #14<br /><br />black-painted metal cork press for pushing corks into bottles, or cork stoppers into test tubes and other lab equipment
Scientific Instruments Collection<br />Chemistry Instr. #15<br /><br />according to Fisher Scientific Co 1958 catalog, this balance (patented in 1932)has a double magnetic damper and chain-weight device; the capacity of the balance is 200 grams, and its sensitivity is 1/20 mg; the balance weighs 68 pounds and the original price was $685.
Scientific Instruments Collection<br />Chemistry Instr. #11<br /><br />analytical balance enclosed in a glass case, balanced on three feet: the two front feet are leveling screws; front of glass case is a sliding window; also one side is a door to allow access to the interior of the case; small 50 mL beaker placed on one scale arm filled with tiny clear spheres; very similar to a balance in the Collection of Historical Scientific Instruments at Harvard (PDF saved in files); May be the Sartorius "No. 8b Balance Standard, Modele USA, 8b" (see remarks)
Scientific Instruments Collection<br />Chemistry Instr. #13<br /><br />slide rules can perform calculations like multiplication, division, and trigonometry, and were replaced by electronic, scientific calculators in the 1970s; consists of the "body," the "slide" (middle piece that slides) and the see-through "cursor" with a "hairline" place-keeper<br /><br />MEDIUM<br />metal (aluminum?), plastic, leather
Scientific Instruments Collection<br />Chemistry Instr. #8<br /><br />instrument with eight terminals or knobs protruding from one long side of the box; blueprint paper with diagram of instrument's function is affixed to the underside of the lid; according to Kenyon College, this was "a standard piece of apparatus in most college and university electrical measurements laboratories for the first half of the 20th century" (PDF in vertical and digital folders)<br /><br />MEDIUM<br />wood, metal (brass?), plastic?, Bakelite?
Scientific Instruments Collection<br />Chemistry Instr. #9<br /><br />measures how much light is refracted or bent when shone through a liquid; a standard chemistry instrument; can also help organic chemistry students to identify compounds; battleship gray instrument with two feet with detachable spill tray; irregularly curved microscope-like shape; attached 110 volt power cord; with a carrying handle
Scientific Instruments Collection<br />Chemistry Instr. #5<br /><br />wooden lidded and hinged box containing balance weights of various weights; single balance weight in wooden block; Cenco No. 70537 tensiometer ring (cannot open); Cenco rubber balloon-like part - very similar rubber part was also displayed with the Höppler Viscometer; metal key; these parts were all grouped together in the Chemistry Department cases
Scientific Instruments Collection<br />Chemistry Instr. #6<br /><br />for measuring the object size under the microscope; a micrometer of a standard diameter (23 mm) that can be used on Ortholux I and II microscopes, as well as other models; the eyepiece magnification is 12.5x
Scientific Instruments Collection<br />Chemistry Instr. #7<br /><br />wooden case can be stood up vertically; four large glass pipettes with two-pronged stoppers, all connected by rubber tubing; possibly "apparatus of the Orsat type," as "ORSAT" is written in black oil crayon on the side of the case, and the Fisher manual title page indicates this as well
Scientific Instruments Collection<br />Chemistry Instr. #2<br /><br />originally three tubes, but the largest tube in our case is missing; remaining tubes: one is a zig-zag shape, the other straight; both have a hollow, bulbous section and are formed from colorless, transparent glass; a stalagometer is used to measure the surface tension of liquids using the "drop weight" method
Scientific Instruments Collection<br />Chemistry Instr. #3<br /><br />this instrument uses the Höppler principle to measure the viscosity of transparent Newtonian liquids and gases by measuring the time required for a ball to fall under gravity through a sample-filled tube; different balls will give different readings; box with balls and a rubber part made by Cenco were also grouped with this instrument in the Chemistry Department cases (measurements below)
Scientific Instruments Collection<br />Chemistry Instr. #4<br /><br />this lettering kit allows one to trace letters with a stylus, while simultaneously producing an exact duplication of each letter on another surface (drawing paper) by using the "Scriber" tool included in the kit; stored in a rectangular mahogany box with brass hooks to secure it; Harvard has a nearly identical instrument in its collection, inventory number 1989-4-0016; contents in remarks section<br />
Scientific Instruments Collection<br />Chemistry Instr. #1<br /><br />this instrument attachment consists of a rectangular mirror on an aluminum arm attached to a black, adjustable metal clamp that can be affixed to a microscope eyepiece; the small scale where the mirror attaches is numbered 15 to 75 to indicate the degree of the angle of the arm; the arm has a scale of 60 to 140 millimeters to indicate the distance of the mirror from the microscope
Scientific Instruments Collection<br /><br />Balance, wooden frame with glass doors, brass and metal balance inside. There are instructions and misc. items in the drawer.<br /><br />glass, wood, brass, metal
Scientific Instruments Collection<br/>Iron and wood machine with two glass wheels with metal plates attached to each. There are two glass jars on either side on either side of which the bottom portion is covered in metal.<br/><br/>glass, metal, wood
