|There are Web sites throughout the world containing
pictures of mechanical calculating machines. Not many such sites have details of the
internal workings of such machines, although collectors and hobbyists like to endeavour to
restore them. Without specific information this task can be risky and damage to the
machine may result. The enclosed pictures and drawings cover the the MADAS 20BTZG and are
provided to assist such hobbyists and enthusiasts. The information should be used in
conjunction with information at http://www.xnumber.com/xnumber/madas.htm.
The author wishes to thank Geoff Bowles for his assistance is allowing the taking of the pictures during the release of a jammed multiplication mechanism. The 20BTZG supplied by Geoff also indicates that many of these machines may be suffering from jellified oil which may need thinning out with kerosene and the mechanism re-oiling with light sewing machine oil.
The images are actually hyperlinks and clicking on them will take those interested that have the patience to the or original size (scan size) image.
A CD of images is available. It contains around 650 Meg of files, information, memorabilia etc and has now been upgraded to include the above MADAS images and the MADAS web site. The CD also, now, includes PDF files of the exploded drawing of the inside of the MADAS 20BTZG. This is, as you may realise, a non-profit venture simply designed to place the information in the hands of mechanical, and electronic, calculator enthusiasts. The idea is to release the information so that it doesn't get lost to future enthusiast.s
The following is a price list for people wishing to get the CD and able to send $AUD:
Other zones are possibly similarly priced to one of the above located near your zone. There seems little rational behind pricing as America is just as far from Australia as any of the others. I guess planes go there more frequently as thus bulk handling is cheaper.
|From: Nicholas Bodley
Subject: Photos of MADAS
Date: Feb 14, 1999
However, the stepped drums in the MADAS don't seem to look like
this, and my guess is that it uses a scheme similar to Monroe and Friden, in which the
1..4 (or, maybe 1..5) tooth group is "re-used" for 6..9, by enabling a 5-tooth
segment to add its count, so that the keyboard selects on a more-or-less biquinary scheme.
In other words, for instance, pressing a 7 key, instead of moving its selector slide 7
positions, and selecting a single 7-tooth level of the stepped drum, actually would select
a 5-tooth level as well as a 2-tooth level. True? (I actually can ask a one-word
|From: Geoff Bowles
Subject: Photos of MADAS
Date: Feb 15, 1999
Just a note to thank Ray publicly for all
his help in fixing my MADAS and for persevering in his efforts to get some of his vast
knowledge to stick in my tiny brain for more than 5 minutes! He has been tireless in
providing advice and encouragement and I would have given up a long time ago leaving just
a pile of nuts and bolts without him.