Pickett Model N600-ES Log Log Speed Rule
Engineering; Mechanical Engineering; Mathematics
Physical Description:
The Pickett Model N600-ES Log Log slide rule is constructed using three yellow painted aluminum bars. The “ES” in the model name means “Eye-Saver” and refers to the yellow painted construction. The two outer bars are called the stators and are attached by a brace on both ends. The braces create a gap between the two stators where the third aluminum bar, called the slide, fits into the grooves between the two stators. A clear plastic cursor slides along the outside of the stators. The cursor has a vertical hairline marker on both sides of the slide rule for lining up the scales between the slide and stators. The upper stator has LL1 and A scales on the front side and LL2 and DF scales on the backside. The lower stator has D, DI, and K scales on the front side and D and LL3 scales on the backside. The slide has B, ST, T, S, and C scales on the front side and CF, Ln, L, CI, and C scales on the backside. The scales are usually logarithmic with a few exceptions such as the L and Ln scale which are log operations with a linear scale. The index of a scale is the furthest left number for the left index or the furthest right number for the right index. The scale ranges and operations are described under inscriptions.
Functional Description:
The Pickett Model N600-ES Log Log slide rule is a duplex slide rule. A duplex slide rule has scales on both sides of the slide rule and a dual-faced cursor. The dual-faced cursor allows for relating one side of the scale to the other side for a greater number of calculations. Logarithmic scales have a multiplication and division property discovered by William Oughtred in 1630 that allow for the operations of multiplication and division instead of addition and subtraction of linear scales. Multiplication is the simplest operation on a slide rule using the two fundamental scales, C and D. To multiply two numbers, x and y, the left index of C is positioned over x on the D scale. Then the cursor is position over y on the C scale. The value of the cursor on the D scale is the solution to x multiplied by y. The decimal place may need to be adjusted to get the correct order of magnitude since the C and D scale has values ranging from 1 to 10. The other scales are used to perform different operations such as squares, reciprocals, exponentials, and sines, cosines, and tangents.
Gideon Hoekstra, Nick Renke, Donovan Doran, Erik Madson
1962
English
Shimadzu UV160U Spectrophotometer
Physics
<h3>Physical Description</h3>
The spectrophotometer consists of four sections; a screen, a touchpad, a glass sample bay, a light bay, and a power control section. The spectrophotometer is similarly built to an early computer with the processing system as a base with a screen and touchpad on the top of the base. The processing system’s base is black metal before transitioning to a cream-colored metal. The power control section is the lowest control on the machine, near the base on the left side. There is an on/off switch in yellow, a fuse dial that is SA(100~117V) to 3A(220~240V), an AC power plug, and a small black dial. On the top of the base, to the left of the keypad, is a light bay. The light bay has a glass covering. Within the light bay, there is a light source, a focusing element, a sample bay, a second focusing element, a light dispersing element, and a CCD array. This is all visual while peering into the compartment. Over the light bay, in the top left corner, is a small printer that uses a receipt-like paper. In the middle of the base top is the keypad. Dividing the keypad into three sections, left, middle, and right, there are about 11 individual pads, not including the number pad. On the left starting at the top left the column is File, Mode, Auto Zero, Return, Yes and No, in the order read like a book. In the middle, there is the typical number pad found on the calculator and then enter pad. On the right going in the same order as the left, there is the Copy, Chart Feed, arrow to the left (-), arrow to the right, and the START/STOP pad. Above the keypads is a monitor screen. On the front right side of the processing unit, there is the manufacturing permanent label. a silver manufacturing plate in Japanese and English on the side to the right. At the back right corner of the processing unit is a large air vent.
<h3>Functional Description</h3>
The Shimadzu UV160U Spectrophotometer works by placing a sample into the testing bay before turning it on. Once the sample is placed, the machine may be turned on to run the sample. The light bulb will shine a light that will be directed through two monochromators, these are film that focuses the light into a single wavelength. The double-focused ray of light is redirected in two directions towards the sample cell side and the reference cell side. The beams of light are both directed to the detector, which is processed by the computer. The computer will then will display the model that is preset using the keypad below the screen. Once results are reviewed they can be printed onto the slip above the sample bay for filing.
<p>A more thorough explanation is available in the C101-E142 UV Talk Letter Vol. 16 [see PDF with images]</p>
Emma Wade, Steven Walton, and Robin Chosa
Shimadzu
1985
Japanese
Physical Object
UV-160U; Cat No. 204-04550-51, Serial No. A11429030004
Forestry, Botany, Chemistry, Physics, 20th century, 21st century, medical