THE ROYAL ARTILLERY INSTITUTION. 
41 
charts the points of impact of the several shot, they were found to be 
uniformly distributed about the target with the exception of three shots from 
“Mellemfort,” which had carried from 400 to 600 feet too far. 
The directing fort “ Provesteen ” having telegraphed this information to 
“ Mellemfort ” the succeeding shot struck just in front of the target. 
The telegraphic method of measuring distances has therefore undergone 
a successful practical trial and its great importance for long range fire with 
modern rifled guns of large calibre is completely established. 
As I have already remarked in my first work on the subject, this method 
can be made use of in fortifications of great extent which comprise detached 
forts, but it is especially applicable and capable of rendering important 
services in maritime fortifications. 
In conclusion I will add that I am ready to supply the government with 
more detailed explanations and to place at its disposal the experience which 
I have acquired. 
(Signed) C. L. MADSEN, 
Inspector in the Administration 
of Government Telegraphs . 
Chevalier du Danebrog. 
Regulations for the measurement of distances y for the use of the Maritime 
Fortifications of Copenhagen . 
1. As the exact measurement of distances requires above all things 
that the different telegrams should be transmitted with rapidity, certainty i 
and clearness, and according to a regular system, the telegraph operators are 
directed to conform rigidly to the following rules 
The telegrams to be as short as possible without introducing any abbre¬ 
viation, from which a misunderstanding might at any time arise. 
Any correspondence between two stations must not be interrupted on any 
account when once begun; and the operators must exclude from their con¬ 
versation all subjects foreign to the matter immediately before them. 
Each station will take care to preface every communication with the mention 
of its name. 
2. While messages are being sent, the operators will concentrate all 
their attention upon their apparatus, and give notice of all the information 
transmitted to their station. 
3. At the commencement of and during each operation, those whose duty 
it is to observe angles, will try to distinguish as quickly as possible all the 
ships in sight, in order that they may be able to find easily any one of them 
which may be indicated. They should frequently test the zero point of the 
horizontal circles of their theodolites, and will keep a general look out in the 
mean direction of whatever ships may be in sight. 
[vol. v.] 6 
