Trough Compass

Trough Compass Manufacturer and Supplier 

The Trough Compass is a surveying accessory used with a plane table or a theodolite to orient the instrument to the magnetic meridian (magnetic north). Its needle is a long (30 cm), narrow, magnetised bar of steel, pointed at both ends and balanced on an agate bearing at the centre for free, sensitive movement — making it a reliable tool for establishing direction in the field.

Applications:

• Orienting a plane table or theodolite to magnetic north
• Establishing the magnetic meridian in surveying
• Plane-table and theodolite survey practicals
• Civil-engineering and surveying laboratory teaching

Key Features:

• 30 cm magnetised steel needle, pointed at both ends
• Agate bearing at the centre for free, sensitive movement
• Trough design for use alongside a plane table or theodolite
• Durable, high-quality construction with after-sales support

Technical Specifications:

Parameter	Value
Needle	Magnetised steel, 30 cm, pointed at both ends
Bearing	Agate, centrally mounted
Length	313 mm
Width	45 mm
Height	190 mm

FAQ:

• Q. What is a trough compass used for? 
• Orienting a plane table or theodolite to magnetic north (the magnetic meridian) during surveying.
• Q. How long is the needle? 
• A 30 cm magnetised steel needle on an agate bearing.
• Do you export this instrument? 
• Yes, LabExports is a manufacturer and exporter serving institutions worldwide.

Why LabExports: manufacturer and exporter of surveying instruments, trusted by institutions across the globe. Request a quote.