German anonymous instruments

#13 German proportional dividers, ca 1700.

#12 German drawing set, 2nd half 19th century. 

#11 German drawing set, mid 19th century.

A small swiss pattern set, the top of the case is marked 'No. 44 Reichert.' The inner arm of the large compass is marked with a 'T' indicating the maker. Case 195x52x23mm.

#10 German drawing set, late 18th to early 19th century. 

A high quality set of brass and steel instruments featuring fixed proportional compasses, triangular compasses and 2 spring bows. Missing are hair dividers(?), a pencil attachment, and an unknown item.

#9 Turn-about compass, 18th century.

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NOTES / REFERENCES

[1] Chambers Cyclopaedia 1728 Volume 1, page 287

[2] Edmund Stone, Nicolas Bion; The Construction and Principal Uses of Mathematical Instruments, 1723, plate IX. [Internet Archive]

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REFERENCES / NOTES

[1] Rudolph, Ludwig; Buch der Geologie, Otto Spamer, Leipzig 1861, p. 32, Google Books.

[2] Beer, August H.; Lehrbuch der Markscheidekunst für Bergschulen und zum Selbstunterrichte, F.A. Credner, Prague, 1856, p.28. 

[3] Dipl.-Ing. Dr. mont. Franz Kirnbauer, Freiberg i. Sa.; Die Entwicklung des Markscheidewesens im Lande Österreich. Blätter für Geschichte der Technik 1940. [ANNO].

[4] Bezold; Gustav von; Wissenschaftliche Instrumente im germanischen Museum, IV. Bussoleinstrumente zu Winkelmessungen. Mitteilungen aus dem Germanischen Nationalmuseum. [Universitätsbibliothek Heidelberg].

#7 German drawing set, 4th quarter 18th century.

Unsigned set of German brass drawing instruments in a dark brown leather covered case, gold stamped border decoration, with 2 brass hook-catches, and a red-coloured chamois interior. Contents include 2 ruling pens, a divider with fixed legs, a hair divider, a divider that can be fitted with ink and pencil attachments as well as an extension leg with an adjustable collar. 

#6 German drawing set, 18th century.

#5 German drawing set, 19th century.

German drawing set with an interesting turn about drop bow compass. The case displays the name A.W.C.K. Stolze whom seems to have been the owner, not the maker. The Verbesserter Nullenzirkel or improved drop bow compass features in an article published in the Polytechnisches Journal of 1870. The article does not mention a maker. Case: 211x110x25mm.

#4 German drawing set, 2nd half 19th century.

#3 Devise for drawing hexagons

Fig. 1: Hand cranked instrument for drawing hexagons. There are 5 discs (the smallest is already in place) for drawing 5 different sizes of hexagons.

Fig. 2: This picture shows the underside of this instrument for drawing hexagons. The ink pen can also be inserted into one of the 6 holes for drawing circles.

#2 Long proportional dividers

Fig. 1: Long proportional dividers (30cm), nickel-silver with steel points. Marked DRGM 437263, German patent dating from 1910, invented by Friedr. August Leiteritz (Warschau). Pivot can be adjusted for ratios ranging from 1:24 to 1:95.

Fig. 2: Two pictures showing the triple-pivot mechanism of the 30cm proportional dividers, unknown maker.