Slide Charts

Musigraph 100
Musigraph 100

Musigraph 100

USD $25

An unusual slide rule for music theory, which to the best of our understanding is used for helping to convert between musical scales.

Manual and documentation can be found here.  If we knew the first thing about music, this link would almost certainly be invaluable.

Stock: 1

Place order

Iwa-Tronic 0272 Frequency Calculator Slide Chart
Iwa-Tronic 0272 Frequency Calculator Slide Chart

Iwa-Tronic 0272 Frequency Calculator Slide Chart

USD $25

A double sided slide chart used for frequency calculations.  Includes original instruction sheet in German.

Stock: 1

Place order

Metric / Imperial Unit Converter
Metric / Imperial Unit Converter

Metric / Imperial Unit Converter

USD $10

This acrylic slide chart has metric and imperial rulers on the upper and lower edges, integrated temperature conversion (F/C), and a sliding component for converting between different metric and imperial units (mass, volume, area, length, etc).

Stock: 1

Place order

Gerber Scientific Variable Scale
Gerber Scientific Variable Scale

Gerber Scientific Variable Scale

USD $75

Designed by H. Joseph Gerber, survivor of a Nazi concentration camp, the Gerber Variable Scale is used to easily complete calculations on graphs and curves.  It is used for graphical applications for which reading, plotting, and interpolating needs to be done.

Both the scale and leather case are in excellent condition.

Stock: 1

Place order

Sterling Pocket Metric Converter
Sterling Pocket Metric Converter

Sterling Pocket Metric Converter

USD $5

Tired of your smartphone giving out on you at the worst time, ruining your unit conversions?  This Sterling pocket metric unit converter is here to save the day.  Handles legnth, area, mass, and volume.

Stock: 1

Place order

Weens & Plath Star-Finder 2102-D
Weens & Plath Star-Finder 2102-D

Weens & Plath Star-Finder 2102-D

USD $25

This star finder and identifier is more versatile than many others, as it comes with 10 different latitude overlays ensuring this star-finder is useable in many different areas.

Includes manual, 10 latitude overlays, double-sided circular map/chart, and protractor.

Stock: 1

Place order

Smithsonian Star Finder Star-Finder 2102-D
Smithsonian Star Finder Star-Finder 2102-D

Smithsonian Star Finder Star-Finder 2102-D

USD $25

Made from two durable acrylic discs with one half having a star map, and the other having the field of view and time of day, this star finder is easy to use and very popular.

Stock: 1

Place order

The Miller Planisphere Star-Finder, Latitude 50 North
The Miller Planisphere Star-Finder, Latitude 50 North

The Miller Planisphere Star-Finder, Latitude 50 North

USD $35

Clear and easy to use, this star finder has two concentric rings on one side for lining up the chart to your surroundings, and easy to understand directions on the reverse side.

Stock: 2

Place order

Procession of the Equinoxes Classical & Historical Planisphere
Procession of the Equinoxes Classical & Historical Planisphere

Procession of the Equinoxes Classical & Historical Planisphere

USD $25

This chart is configured for 30-40 degrees in the southern hemisphere.  This chart not only helps identify which stars are visible at any hour and day, but also shows this information thousands of years into the past, the present, and well into the future.

Stock: 1

Place order

Polhemus Celestial Computer – Air Navigation Type CPU-41/P
Polhemus Celestial Computer – Air Navigation Type CPU-41/P

Polhemus Celestial Computer – Air Navigation Type CPU-41/P

USD $150

Don’t be caught in the cockpit without this device!  Set comes complete with case, manual, multiple charts, and double sided circular slide rule.

Provides arithmetic and vector solutions for for aircraft speeds of 90 to 2 000 knots, with consideration of errors due to aircraft acceleration.  Dead reckoning capability of a plotting board.

Stock: 1

Place order

Fraction of an Inch Adding Machine

Fraction of an Inch Adding Machine

USD $15

If you’re still refusing to use the metric system, and don’t want to do your calculations using fractional lengths of football fields, then this circular slide chart will be very useful.  On the inner ring it provides calcualtions in both fractional and decimal quantities.

Stock: 1

Place order

Digi-Craft Thermometer Ruler / Paperweight
Digi-Craft Thermometer Ruler / Paperweight

Digi-Craft Thermometer Ruler / Paperweight

USD $35

This ruler uses temperature responsive liquid crystals to read-out room temperature in C/F.  It also features metric and imperial measures on the upper and lower edges, and a slide in the center for completing metric/imperial conversions for mass, volume, and distance.

Stock: 1

Place order

US Navy 2102-D Star Finder and Identifier
US Navy 2102-D Star Finder and Identifier

US Navy 2102-D Star Finder and Identifier

USD $35

This is an adjustable star finder that provides nine discs that can be overlaid on the primary navigating chart, allowing for latitude adjustments.

Stock: 1

Place order

Sterling 565 Automatic Adding Machine

Sterling 565 Automatic Adding Machine

USD $15

The Sterling “Add-It” machine uses an included stylus to allow a user to add and subtract.  Usage directions printed on the front of the device.

Stock: 1

Place order