Heliograph

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Ingenium, 1985.0667.001
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OBJECT TYPE: PORTABLE/5 IN.
DATE: Unknown
ARTIFACT NUMBER: 1985.0667.001

MANUFACTURER: Unknown
MODEL: HELIO 5-INCH MK.V
LOCATION: Unknown

More Information

General Information

Serial #: B24178
Part Number: 1
Total Parts: 8
AKA: N/A
Patents: N/A
General Description: Heliograph made of brass/leather carryingcase/glass reflecting mirrors/tin spare mirror box/canvas carrying strap.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length: 22.0 cm
Width: 16.5 cm
Height: 8.5 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Exploration and Survey
Category: Survey equipment
Sub-Category: N/A

Manufacturer

AKA: Unknown
Country: Unknown
State/Province: Unknown
City: Unknown

Context

Country: Unknown
State/Province: Unknown
Period: Unknown
Canada: Unknown
Function: TO PROVIDE LUMINOUS SIGNAL FOR OBSERVATION BETWEEN DISTANT POINTS DURING TRIGONOMICAL SURVEYS. THE SIGNAL IS SIGHTED BY A THEODOLITE AND THE ANGLE BETWEEN THE ESTABLISHED SIGHTS MEASURED IN ORDER TO DETERMINE DISTANCE.
Technical: ESSENTIALLY A PLANE MIRROR MOUNTED ON A TRIPOD AND TURNED BY MEANS OF A SLOW MOTION SCREW TO FOLLOW THE SUN AND CAST THE BEAM IN A CONSTANT DIRECTION. UNDER IDEAL CONDITIONS THE BEAM MAY BE OBSERVED AT A RANGE OF 100 MILES.
Area Notes: Unknown

Details

Markings: .1: 'HELIO 5" MARK V/C & D/B24178' incised on base/.6: '5" HELIO' incised on tool/.8: 'J.P. & S. [--] DEPT.' stencilled in grey on reverse of mirror/Box containing.7 &.8, and overall casing contains some written info.: for transcript, please see Supp. Info. File.
Missing: N/A
Finish: Most of heliograph has black crinkle finish/leather is brown.
Decoration: N/A

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If you choose to share our information about this collection object, please cite:

Unknown Manufacturer, Heliograph, Unknown Date, Artifact no. 1985.0667, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingenium.ca/en/id/1985.0667.001/

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