General Development of the D.H.I. during 1956 
- Sfiite 79 - 
by inclusion of two Norwegian ports, appeared as usual. 
The Hamburger Sternwarte at Bergedorf placed most obligingly at the 
disposal of the Time Service a 90 mm transit instrument for the duration of 
the International Geophysical Year. The, instrument was set up and taken into 
operation at the end of the year under review. In these circumstances it was . 
possible for the own '77 mm transit instrument to undergo the necessary general 
repair. 
The manufacture of the single parts of the photographic zenith telescope 
is finished. The mounting of the instrument in the workshop was commenced. 
Two out of a total of sis precision quartz clocks built after the design 
of the Bhysikalisch-Technische Bundesanstalt were completed and put into 
operation. 
In cooperation with the Bundespost and the Bhysikalisch-Technische Bun 
desanstalt permanent second-signals will be transmitted by night via the trans 
mitter Mainflingen (77,5 kc/s). The quartz-controlled signal-giving devices 
including current supply were completed. 
The mechanical contacts of the devices transmitting the DHI time-signals 
were replaced by electronic ones and a considerable increase in accuracy 
reached thereby. 
This year again the DHI cooperated with the Bhysikalisch-Technische Bun 
desanstalt, the Fernmeldetechnische Zentralamt and the Hamburger Sternwarte 
at Bergedorf by regularly exchanging quartz clock contacts, and the results 
of astronomical' time determinations. 
The chronometer testing service experienced another increase in the test 
ings of ship's chronometers. Frequent requests to the Institute were again 
made for chronometers on hire. 
The "Kleine Funkworterbuch", a dictionary contributing to the introduction 
of uniform German special terms in the field of radio position fixing was pub 
lished as an attempt in 1956 in the periodical "Der Seewart". The DHI will wel 
come any suggestion which will improy.e this booklet. At this place it may be 
mentioned that the "Seewart" is highly dependent on the cooperation of the sea 
faring mariners and that its editors will greatly appreciate any contribution. 
In spite of the almost too many claims laid on the navigators on board, the 
desire may be expressed here to receive as many contributions as possible to 
this periodical which is jointly published by the DHI and the Seewetteramt. 
For the sake of improving the safety of ships at sea, numerous investi 
gations, experimental treatments, and testings of nautical equipment and in 
struments were carried out. The development or procurement of important new 
testing facilities was likewise accomplished. 
To investigate further the "dynamic" error of magnetic compasses installed 
in survey and research-ship "Gauss", bad weather tests were continued in spring