Requirements 
Accelerating progress is a positive feature of our 
age, Much research work is done to maintain this. Scien- 
tific periodicals are required to’ make the results of 
these investigations known and to stimulate other rese- 
archers. 
Additional reasons for the existance of photogramme- 
tric periodicals are to publish 
— book reviews; 
= reports on congresses, symposia, technical meetings 
etc, ; 
— niews on national and international bodies and their 
activities as well as on what happens in the photogram- 
metric community. 
To achieve this task, a long interval between conse- 
cutive publications, e.g. twice a year, is insufficient. 
Difficulties 
Photogrammetric periodicals are financed from two 
sources: subscription and advertisements. The cost per 
copy depends on the number of pages and on the print run: 
- more pages result in higher costs; 
— higher print run, however, decreases the costs. 
No difficulty apparently exists for a photogrammetric 
periodical with some 1.200 pages plus 500 pages adverti- 
sement for 12 issues and a print run of 9.000. All other 
photogrammetric periodicals, as far as they still exist, 
present annually less than 300 pages plus 50 pages adver- 
tisement with a print run around 1.000. 
The main difficulty is that a print run of 1.000 is 
too little for publication of a periodical at a price 
which can be accepted by photogrammetrists.