Two short fragments resulting from experiments in controlling the mechanical development of the instrument. Preserved by the Academy Film Archive in 2005.
2/9/1944
1/29/1949
1/1/1953
12/21/1943
3/13/1971
5/18/1990
12/17/1993
12/26/1941
7/13/1981
10/18/1945
9/6/1946
1/1/1973
11/27/1977
1/2/1953
1/1/1950
10/1/1930
2/5/1951
2/3/1946
6/24/1938
7/10/1969
7/18/1980