Astrolabe Catalogue

Throne

The throne is of the engraved type with satyrs support(s). The throne is attached with a screwed base. The coat of arms engraved on both sides of the throne resemble that of the Frisian family of the Schenckels. The central part of the throne is attached to the base by two screws.

Ring

The ring is of the simple, round cross-section type (i.e. simple plain ring made from a round rod or piece of metal) made of brass.

Shackle

Shackle of the eye-bolt type (i.e. any shackle that attactes to the ring via an eye-bolt type feature)made of brass. The octagonal eye-bolt attaches to the throne via an ornate hexagonal mechanism and a rotating pin.

Mater

The mater and limb are of two pieces, riveted construction. . Scales on the limb:

Type	Range & Units	Numbered	Geometry	Location
Equal hours	1 - 12 Times of day	Every 1 hours	Circular, concentric	outer
Degree	0 - 360 Degrees	Every 10 degrees	Circular, concentric	outer2
Shadow square	1 - 12 Fingers	Every 1 fingers	Circular, concentric	outer3
Shadow square	1 - 12 Fingers	Every 1 fingers	Circular, concentric	outer3

The limb is inscribed:

Content	Translation	Notes	Type
Regnerus Arsenius Nepos Gemmæ Frisÿ fecit Louanÿ anno 1565	Made at Louvain in 1565 by Regnerus Arsenius, nephew of Gemma Frisius	This signature is located on the limb, just below the throne	Maker's signature
MERIDIES	South	This inscription is located directly below the throne	Direction
OCCIDENS	West	This inscription is located at the 3 o'clock position	Direction
SEPTENTRIO	North	This inscription is located at the bottom of the instrument	Direction
ORIENS	North	This inscription is located at the 9 o'clock position	Direction

Womb

The womb is engraved with a Quadratum nauticum and a windrose.
The womb contains 2 scales of the following types:

Type	Range & Units	Numbered	Geometry	Location
Quadratum nauticum	0 - 90 Degrees	Every 10 degrees	Box	None
Windrose	N/A Direction	Not numbered	Circular, concentric	None

The womb is inscribed:

Content	Translation	Notes	Type
MERIDIES	South		Direction
OCCIDENS	West		Direction
SEPTENTRIO	North		Direction
ORIENS	East		Direction