Lynda Beckler, one of the well-known ladies of typewriter collecting, has dragged out some of her heaviest machinery for our presentation.  Her home is literally filled with typewriters; it's said that you can't go anywhere without being able to see one.  She also has her own, complete and functioning workshop dedicated to typewriters.  Lynda has literally been all over the world in pursuit of the hobby, and her well-travelled experience brings you the machines you see below.
KANZLER No. 2  /  ADLER No. 7
One of Lynda's "pride and joy" machines, and really a quite rare one at that, is the KANZLER.  This is among the very largest thrust-action machines built in what we might today call the "original" configuration for such machines.  It is pictured next to her already slightly large Adler No. 7.  The Kanzler employed a complicated, but ingenious type-bar system in which all the keys in one column act upon one single type bar.  This may seem curious until you see our next shot.
On the right, a detail shot from Lynda which looks down from the left side, slightly forward at the actual type bars.  You can see that each is actually very tall; in fact, there are eight characters or figures on each one of them.  The mechanism is designed so that depression of each key in a (radially oriented) column determines angular orientation of the type-bar as well as moves it to the print point.  The shift keys stick out the front of the lower frame, and naturally orient for capitals or else figures.  These did not last very long; they came on the market in Germany about 1903-1904 and were out of production by about 1912.

There are a large number of brands of German-made machines which were made in some numbers in the first half of the 20th century, but which do not survive in great numbers.  Two devastating World Wars, and the demand for typewriters for military use during, and civlian use after, coupled with "trade-in" allowance offered by makers following both, has heavily reduced the number of such machines available. 

One such brand is URANIA; Lynda's example is seen here.  These were built from 1909 by Clemens Muller of Dresden, Germany.
STEARNS VISIBLE No. 2    s/n 4502
In relation to the Urania above, there is also a group of American-made standard typewriters which were on the market at various times in the early 20th century, built to different designs by a wide variety of concerns, which are either now uncommon or else were uncommon even when being built.  The STEARNS VISIBLE falls into this last category.  Lynda notes that her example is all the more unusual due to the fact that it is built for writing in Czech.