= 18 - 
These several activities common to all micrographics gain 
credence and acceptance only when treated as a group. For 
whereas the filming procedure is confined to 3 basic types 
of cameras and the format for storage is bound under the 6 
methods enumerated herein, retrieval and copying procedures 
are numerous ranging from the ordinary to the highly 
sophisticated, combining computer assisted methods. 
THE MICROFICHE METHOD 
  
Ihis printed address includes a microfiche of a number of 
technical papers and these have all been subjected to 
reductions of 24x and 48x enabling an assessment to be made 
of the quality and packing density of the information. 
24x Reduction is normally that accorded hard copy micro- 
graphic filming. Under such a reduction and using A4 paper 
and working to international microfilm standards each microfiche 
Should contain 126 frames. (7 rows x 18 frames). 
48x Reduction is an accepted I.S.0. standard for Computer Output 
Microfilm (C.O.M.) Under such a reduction and using A4 copy 
each microfiche should contain 270 frames (15 rows x 18 frames). 
  
  
The technical papers included are:- 
  
Photogrammetric Record - October 1981 
M.J.D. Brand pp 447 - 456 
Bildmessung and Luftbildwesen, Jan 1982 
B. Pfeiffer pp 35 - 48 
Bulletin de la Societe Francaise de Photogrammetrie 
et de Teledetection (No. 82 1981-82). 
Dowman and Newby pp 41 - 47 
Photogrammetric Engineering and Remote Sensing 
Nov 1981 Vol 8-11 S.E. Massy pp 1561 - 65 
Forthcoming Activities of Commission VI 
I.S.P.R.S. First circular Appendix 3 1981 
To finish the group I have included a copy of this address. 
  
  
  
  
The camera used was the MICRODAP 5000 designed by a Mr. H. Spence- 
Bates on behalf of Brookeades - a Western Australian company 
active in the manufacture and supply of a wide range of surveying 
and other sciéntific equipment. 
It is a sophisticated step and repeat camera with a variety of 
available peripherals including COM, first displayed at the 
Australian Micrographic Congress in 1977. 
  
The original negative used is a silver halide emulsion completed 
at a cost of $5. : 
The duplicated copies have been prepared on a diazo emulsion and 
300 copies were completed in some 10 minutes at a cost of $15 
(materials) plus instrument amortisation and labour - (Basic 
cost per fiche including original negative - 10 cents). 
  
Glendinning 6