General Development of the G.H.Ï» during,I960 
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also to those equipments which were operated already before that date. 
Practical experiences so far won have shown that the accuracy of indication 
especially of radar equipments can be seriously impaired by board influences. 
Following laboratory investigations taken up last year in connection with 
the influence which outside magnetic fields have on the centre of the screen, 
measuring of the field intensity was commenced with on board to find out the 
most suitable place for the installation of the radar equipment. 
Owing to repeated complaints about too small an output of the German 
transmitters for the calibration of the direction findings and about distur 
bances at the calibration produced by transmitters working on the same fre 
quency, the German calibration transmitters in the North Sea and Baltic as 
well as Netherlandish, British and French ones were re-checked with regard 
to their field intensity at the calibration place during several trial trips 
of survey and research ship "Gauss", partly mutually with the "Seezeichenver- 
suchsfeld". For several German calibration transmitters it became necessary 
to increase their output or to change their frequencies respectively, 
The experiments for the creation of a radio beacon which contains a radar 
reflector in the form of a spar, which will serve at the same time as aerial 
of a distress transmitter in the upper part of the medium frequency band, were 
successfully continued in the sea area off Helgoland. These distress trans 
mitters yielded ranges for a clear indication of approximately 40 - 50 sm, 
The method developed in the G.H.l. to examine in a motor-car on highways 
the influence of continuous long-lasting acceleration upon the indication of 
gyroscopic compasses has been further improved. It has turned out as a valuable 
and necessary supplement towards the investigations so far undertaken in the 
testingroom and at sea and will form a permanent feature in future type-testings 
In cooperation with the manufacturers steps were undertaken to increase the 
accuracy of indication of the echo-sounders on board of "Gauss" by installing 
checking and regulation devices and to adapt them still better to the various 
requirements of scientific investigations. 
The holdings of the library amount to approximately 70 000 volumes - losses 
caused by World War II could in part be restored; the number of periodica are 
about 1 500. In the library, mutually owned by the German Hydrographic Insti 
tute and the Seewetteramt, the following work is carried outs 
(1) the compilation of a modern subject-catalogue 
(2) a complete documentation for the North Sea and Baltic. 
The archives comprise at present approximately 150 000 German and foreign 
charts; the yearly accessions lie between 4 000 and 5 000 copies.