Lotter

Original Lotter Ellypso 1 ellipsograph


REFERENCES / NOTES

 

Joh. Chr. Lotter is especially known for his parallel compass, the first version DRGM 78651 invented in 1897, see Der Mechaniker vol. 19., page 320-321, 1897. An improved version DRGM 333756 was patented in 1908 [see also 1911 DRP 238295 with an attachment for drawing polygons] and in 1950-53 DRP 899420, DRP 1613553 and US 2659155A. 

A quick overview of parallel compasses patents pre WW2 are:

1849: Eduard Boissier, Prussian pat. 290. Dingler's Polytech. Journal 

1858: Anton Schaefer, US pat. 19589.

1883: James B. Tetley, US pat. 279460.

1886: Charles Albert, US pat. 341714.

1895: Eduard Lepszy (1855-1932) German pat. DRP 85163.

1897: Johann Christian Lotter, German pat. DRGM 78651.

1902: Claus Brandell, US pat. 709738 and German pat. 147167.

1903: Charles Edward Hand, US patent 724697.

1904: Philip S. Palmer, US pat. 762553.

1904: Fritz Conrady, German pat. 159997.

1906: Oswald Zwach, German pat. 193181.

 

1908: Johann Christian Lotter, German pat. DRGM 333756.

1909: Charles Edward Hand, US pat. 920461.

1910: Harry Vaughan Nunn, British pat. 4319 (=Halden's vertical drawing compass). Depatisnet

1911: Johann Christian Lotter, German pat. 238295.

1911: Charles Edward Hand, US pat. 1008140.

1912: Marcel Bieuville, German pat. 259456.

1915: Charles Edward Hand, US pat. 1145016.

1924: Joseph Rollin Engers, US pat. 1515943.

1930: L. Robar & Co., German pat. 493960.

1936: Friedrich Maybaum, German pat. 638159.


German patents can be accessed via the online database at Depatisnet, and US patents via Google Patents.