= 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