Collections Menu

Date: 1968

Inventory Number: 2004-1-0379

Classification: Slide Rule

Subject:

Author: Michael Hercher

Maker: Institute of Optics, University of Rochester (founded 1929)

Cultural Region:

Place of Origin:

Dimensions:

9.1 × 21.6 × 0.3 cm (3 9/16 × 8 1/2 × 1/8 in.)

DescriptionA hollow plastic conversion card printed on both sides, with a transparent slider containing a single vertical black line at its center, and a column on the left where the units of the scales to be converted are printed. A second card inside is printed with a scale that is seen through a window on one of the scales on the back of the card.

The front of the card is titled "OPTICAL SPECTRUM / BAND WIDTH CONVERSION CALCULATOR", and contains 10 horizontal scales in a vertical arrangement. The scales are logarithmic, extending from a wavelength of 0.1 microns on the left, to 100 microns on the right. In addition to wavelength, which is the scale closest to the bottom, it contains (top to bottom) delta-e.v.; delta-J (Joules); delta-sigma (cm^-1); delta-frequency; delta-wavelength (Anstroms); sigma (cm^-1); e.v.; Joules and frequency (Hz).

On the back side, the card contains several physical and mathematical constants, a table titled "IMPORTANT LASER WAVELENGTHS", with the values for Helium-Neon, Argon, Krypton ion, Co2, Ruby and YAIG lasers.

Below, the back side has two conversion scales. The first one is a simple fixed scale titled "OPTICAL DENSITY" above and "TRANSMISSION" below.

The second scale, titled "LENS FORMULA CALCULATOR" is a superposition of a fixed scale on the bottom titled "F" and a moveable scale titled "S" which is displaced by pulling the inside card.

The front of the card is titled "OPTICAL SPECTRUM / BAND WIDTH CONVERSION CALCULATOR", and contains 10 horizontal scales in a vertical arrangement. The scales are logarithmic, extending from a wavelength of 0.1 microns on the left, to 100 microns on the right. In addition to wavelength, which is the scale closest to the bottom, it contains (top to bottom) delta-e.v.; delta-J (Joules); delta-sigma (cm^-1); delta-frequency; delta-wavelength (Anstroms); sigma (cm^-1); e.v.; Joules and frequency (Hz).

On the back side, the card contains several physical and mathematical constants, a table titled "IMPORTANT LASER WAVELENGTHS", with the values for Helium-Neon, Argon, Krypton ion, Co2, Ruby and YAIG lasers.

Below, the back side has two conversion scales. The first one is a simple fixed scale titled "OPTICAL DENSITY" above and "TRANSMISSION" below.

The second scale, titled "LENS FORMULA CALCULATOR" is a superposition of a fixed scale on the bottom titled "F" and a moveable scale titled "S" which is displaced by pulling the inside card.

Signedfront bottom: INSTITUTE OF OPTICS / UNIVERSITY OF ROCHESTER

rear bottom: COPYRIGHT 1968 M. HERCHER MADE IN U.S.A.

rear bottom: COPYRIGHT 1968 M. HERCHER MADE IN U.S.A.

Inscribedheader: OPTICAL SPECTRUM/BAND WIDTH CONVERSION CALCULATOR

footer: SPECTRUM AND LINEWIDTH / CONVERSION SET WAVELENGTH TO INDEX: / READ Δλ vs. Δν etc.

on back, first column: AIRY DISC DIAMETER = 2.44λ(f/No.) / OPTICAL DENSITY, D = -log_{10}(T)=0.4343αΧ] / POLARIZING ANGLE, &Theta_{b} = tan^{-1}(n_{1}/n_{2}]) / ^{-4}rad. / 1" = 4.85 x 10^{-6}rad.

on back, second column:_{2} 10.592, 10.612μ / RUBY 6943A° (20° C) / YAIG: Nd 1.0641μ(20° C) / *(in air:n≅1.00029

on back, third column: CONSTANTS / c = 2.99793 x 10^{10}cm/sec. / e = 1.602 x 10^{-19} coulomb / N = 6.023 x 10^{23} mol^{-1} / k = 1.3805 x 10^{-23} j/°K / h = 6.626 x 10^{-34} j-sec. / σ = 5.67 x 10^{-12}watt/cm^{2}°K^{4}

bottom half: OPTICAL DENSITY / TRANSMISSION / LENS FORMULA CALCULATOR Set index on S scale to focal length on F scale. / Read image distance on F opposite object distance on S

footer: SPECTRUM AND LINEWIDTH / CONVERSION SET WAVELENGTH TO INDEX: / READ Δλ vs. Δν etc.

on back, first column: AIRY DISC DIAMETER = 2.44λ(f/No.) / OPTICAL DENSITY, D = -log

- ANGLE MEASURE

on back, second column:

- IMPORTANT LASER WAVELENGTHS

on back, third column: CONSTANTS / c = 2.99793 x 10

bottom half: OPTICAL DENSITY / TRANSMISSION / LENS FORMULA CALCULATOR Set index on S scale to focal length on F scale. / Read image distance on F opposite object distance on S

FunctionTo convert among different units of common usage in optics, specifically laser optics.

ProvenancePrivate Donor, Troy, NY, 2004.

Copyright © 2017 The President and Fellows of Harvard College | Privacy | Accessibility | Report Copyright Infringement