**155**media by topic ∙ page

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## Rolling Disc Planimeter (30792310011)

Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting dial reading.

## Triangular 24-Inch Engineering Scale (30245415043)

Cartographers used this tool to take linear measurements from maps and scale diagrams. If two of its six available scales matched those of a map original and desired copy, the tool could be used to accurately m... More

## Austin Photo Interpretometer (Stereoscope) (30880917865)

This device enabled 3-D viewing of stereo pairs of aerial photography. It has a height finder and scale for making linear measurements.

## Reducing Glass (30764630992) - Drawing. Public domain image.

This glass reduces rather than magnifies. Cartographers often produced a final map at 50-75 percent of its draft size, and this tool allowed them to visualize how their draft line work would appear at the final size.

## Austin Photo Interpretometer (Stereoscope) (30764640322)

This device enabled 3-D viewing of stereo pairs of aerial photography. It has a height finder and scale for making linear measurements.

## Dietzgen Champion Drawing Instruments (30249066494)

Typical map drafting tools included these German-made ruling pen, compasses, and miscellaneous small parts.

## French Curve Drafting Set (30844679326)

Cartographers used this set of 50 templates to draw smooth arcs for geographic latitude and longitude lines, flow arrows, and other very-large-diameter curves.

## French Curve Drafting Set (30844687716)

Cartographers used this set of 50 templates to draw smooth arcs for geographic latitude and longitude lines, flow arrows, and other very-large-diameter curves.

## Mechanical Dashed Line Instrument (30792308421)

The three notched discs and a drafting pen mounted on the spring-loaded base created different dash-line patterns for boundary, road, river, and other linear map symbols.

## Mechanical Protractor (30792310221) - Public domain map

Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.

## Rolling Disc Planimeter (30249067174)

Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting dial reading.

## Rolling Disc Planimeter (30579649060)

Cartographers used this German-made device to accurately measure the size of an area on a map or plan by tracing the area’s outline. The area calculation used the resulting dial reading.

## Triangular 24-Inch Engineering Scale (30792309161)

Cartographers used this tool to take linear measurements from maps and scale diagrams. If two of its six available scales matched those of a map original and desired copy, the tool could be used to accurately m... More

## French Curve Drafting Set (30764628872)

Cartographers used this set of 50 templates to draw smooth arcs for geographic latitude and longitude lines, flow arrows, and other very-large-diameter curves.

## French Curve Drafting Set (30844687816)

## Keuffel & Esser 20.5-inch Slide Rule (30764634782)

Long before electronic computers existed, cartographers used mechanical slide rules such as this to perform various mathematical calculations.

## Keuffel & Esser 20.5-inch Slide Rule (30880924725)

Long before electronic computers existed, cartographers used mechanical slide rules such as this to perform various mathematical calculations.

## Map Measuring Tool (30245413703)

With this tool, cartographers could measure linear distances on maps by running the tiny wheel along the line between two points. Then they calculated the actual ground distance using the dial reading and the m... More

## Spline “Whale” Weight (30245414823) - Public domain map

Cartographers used weights such as this to hold down long flexible French curves while drawing lines. The weights also came in handy for holding large maps flat and keeping them from sliding off work tables.

## Triangular 24-Inch Engineering Scale (30245415173)

Cartographers used this tool to take linear measurements from maps and scale diagrams. If two of its six available scales matched those of a map original and desired copy, the tool could be used to accurately m... More

## Triangular 24-Inch Engineering Scale (30792309231)

## Austin Photo Interpretometer (Stereoscope) (30579646290)

This device enabled 3-D viewing of stereo pairs of aerial photography. It has a height finder and scale for making linear measurements.

## Austin Photo Interpretometer (Stereoscope) (30792300711)

## Dietzgen Champion Drawing Instruments (30880921375)

Typical map drafting tools included these German-made ruling pen, compasses, and miscellaneous small parts.

## French Curve Drafting Set (30245400913)

## French Curve Drafting Set (30844679456)

## French Curve Drafting Set (30880915675)

## Rolling Disc Planimeter (30792301871)

## Scripto Thick Graphite Leads (30880925395)

Drafting pencils

## Ten-Point Divider (30245415273)

Cartographers used this Japanese-made tool to divide the distance between two points into ten equal parts, for example, to read distances and locations on a map or to evenly divide drawn objects into ten smalle... More

## Beam Compass Clamps (30792300911)

These clamps held the needle point and pen or pencil onto a beam compass used for drawing circles.

## Beam Compass Clamps (30792308031)

These clamps held the needle point and pen or pencil onto a beam compass used for drawing circles.

## Compensating Polar Planimeter (30880918765)

Cartographers used this German-made device to assist in accurately measuring the area of a plane. By tracing the map outline of the plane, they could calculate the area from the dial reading.

## French Curve Drafting Set (30880915615)

## French Curve Drafting Set (30880915965)

## Rolling Disc Planimeter (30764633162)

## Rolling Disc Planimeter (30764633442)

## Rolling Disc Planimeter (30792309301)

## Rolling Parallel Rule (30880924535) - Public domain map

Cartographers used these devices to aid in cutting or drawing parallel lines and aligning text. Because “VR” is marked on the base, we know this one belonged to Virginia Robinson, who served in OSS from 1942 to 1947.

## Speedball Pens, Model LC‐4 (30579641550)

Speedball Pens, Model LC‐4

## Triangular 24-Inch Engineering Scale (30579641850)

## Beam Compass Clamps (30792300951) - Public domain map

These clamps held the needle point and pen or pencil onto a beam compass used for drawing circles.

## Compensating Polar Planimeter (30844680826)

Cartographers used this German-made device to assist in accurately measuring the area of a plane. By tracing the map outline of the plane, they could calculate the area from the dial reading.

## French Curve Drafting Set (30764628422)

## French Curve Drafting Set (30880916105)

## French Curve Drafting Set (30880916325)

## Map Measuring Tool (30245413623)

With this tool, cartographers could measure linear distances on maps by running the tiny wheel along the line between two points. Then they calculated the actual ground distance using the dial reading and the m... More

## Mechanical Dashed Line Instrument (30764631672)

The three notched discs and a drafting pen mounted on the spring-loaded base created different dash-line patterns for boundary, road, river, and other linear map symbols.

## Mechanical Dashed Line Instrument (30792308351)

The three notched discs and a drafting pen mounted on the spring-loaded base created different dash-line patterns for boundary, road, river, and other linear map symbols.

## Proportional Divider (30880926105)

Cartographers used this device to proportionally convert distances on one map to distances on enlarged or reduced copies. After setting the desired scale difference (10-110 percent), one end measured the origin... More

## Rolling Disc Planimeter (30792309381)

## Spline “Whale” Weight (30579641720) - Public domain map

Cartographers used weights such as this to hold down long flexible French curves while drawing lines. The weights also came in handy for holding large maps flat and keeping them from sliding off work tables.

## Austin Photo Interpretometer (Stereoscope) (30579646380)

## Compensating Polar Planimeter (30844680656)

Cartographers used this German-made device to assist in accurately measuring the area of a plane. By tracing the map outline of the plane, they could calculate the area from the dial reading.

## Dietzgen Champion Drawing Instruments (30792308721)

Typical map drafting tools included these German-made ruling pen, compasses, and miscellaneous small parts.

## French Curve Drafting Set (30764637592)

## French Curve Drafting Set (30880915895)

## Master Bi-Cutter Tool (30792301301) - Public domain map

Cartographers used this tool to cut tape of varying widths for use in the photographic reproduction of maps.

## Mechanical Protractor (30792301981) - Public domain map

Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.

## Rolling Disc Planimeter (30579649270)

## Rolling Disc Planimeter (30764633292)

## Rolling Disc Planimeter (30844694826)

## Scripto Thick Graphite Leads (30880910405)

Drafting pencils

## Spline “Whale” Weight (30245414943) - Public domain map

Cartographers used weights such as this to hold down long flexible French curves while drawing lines. The weights also came in handy for holding large maps flat and keeping them from sliding off work tables.

## Beam Compass Clamps (30792307871) - Public domain map

These clamps held the needle point and pen or pencil onto a beam compass used for drawing circles.

## Dietzgen Champion Drawing Instruments (30792308641)

## Dietzgen Champion Drawing Instruments (30792308681)

## French Curve Drafting Set (30764637682)

## French Curve Drafting Set (30844678906)

## French Curve Drafting Set (30880914705)

## French Curve Drafting Set (30880916205)

## Lettering Guide Set with Pens (30880917295)

Cartographers traced these templates with a pen of the desired line weight to ink precise letters onto maps.

## Lettering Guide Set with Pens (30880917505)

Cartographers traced these templates with a pen of the desired line weight to ink precise letters onto maps.

## Mechanical Dashed Line Instrument (30844692736)

## Reducing Glass (30764631082) - Drawing. Public domain image.

This glass reduces rather than magnifies. Cartographers often produced a final map at 50-75 percent of its draft size, and this tool allowed them to visualize how their draft line work would appear at the final size.

## Rolling Disc Planimeter (30579649410)

## Austin Photo Interpretometer (Stereoscope) (30880917905)

## Beam Compass Clamps (30844691936) - Public domain map

These clamps held the needle point and pen or pencil onto a beam compass used for drawing circles.

## Compensating Polar Planimeter (30880918835)

## Dietzgen Champion Drawing Instruments (30249066554)

## Dietzgen Champion Drawing Instruments (30764632442)

## French Curve Drafting Set (30880913855)

## French Curve Drafting Set (30880915365)

## French Curve Drafting Set (30880915525)

## French Curve Drafting Set (30880915775)

## French Curve Drafting Set (30880915865)

## Lettering Guide Set with Pens (30880917235)

Cartographers traced these templates with a pen of the desired line weight to ink precise letters onto maps.

## Rolling Parallel Rule (30249068114) - Public domain map

Cartographers used these devices to aid in cutting or drawing parallel lines and aligning text. Because “VR” is marked on the base, we know this one belonged to Virginia Robinson, who served in OSS from 1942 to 1947.

## Rolling Parallel Rule (30880924415) - Public domain map

Cartographers used these devices to aid in cutting or drawing parallel lines and aligning text. Because “VR” is marked on the base, we know this one belonged to Virginia Robinson, who served in OSS from 1942 to 1947.

## Compensating Polar Planimeter (30844691546)

## Dietzgen Champion Drawing Instruments (30844693466)

## French Curve Drafting Set (30249063524)

## French Curve Drafting Set (30880913735)

## French Curve Drafting Set (30880914015)

## French Curve Drafting Set (30880914545)

## French Curve Drafting Set (30880914765)

## French Curve Drafting Set (30880915115)

## Keuffel & Esser 20.5-inch Slide Rule (30764634682)

Long before electronic computers existed, cartographers used mechanical slide rules such as this to perform various mathematical calculations.

## Map Measuring Tool (30579640970) - Public domain map

With this tool, cartographers could measure linear distances on maps by running the tiny wheel along the line between two points. Then they calculated the actual ground distance using the dial reading and the m... More

## Master Bi-Cutter Tool (30249066044) - Public domain map

Cartographers used this tool to cut tape of varying widths for use in the photographic reproduction of maps.