First progress report on a multi-channel magnetic drum inner ...

IX. Design of the 44 Cy^annel Drum System
IX-1
This section vdll be devoted to a description of an internally
supported 44 channel drum system. At the time of the writing of
this <strong>report</strong> (July 1, 1948), the <strong>progress</strong> toward the physical realiza-
tion of this drum system is as follows:
1. The drum has been designed, built and mounted with its drive
motor and step-up pulleys.
2. The design of a multiple head consisting of 44 single-wire
heads mounted in one horizontal row has been completed and a unit is
now in the process of being built, 'herefore the drum can bfe illus-
trated by means of jiiotographs as well as drawings, whereas a description
of the multiple head must be based, for the present, on drawings alone.
8.1 Design of the J^otation Drum
Photograph 2 and Drawing C-$-2013 illustrate completely the con-
struction of the drum. Figure A is a photograph of the completed drum
with its drive motor and step-up pulleys. The two end bearing blocks
of the drum are made of 2" thick aluminum and are mounted on a section of
heavy steel chsinnel. The drive motor and step-up pulleys are also mounted
on a section of steel channel. These two steel mounting channels are
separated from the base plate by strips of a standard rubber vibration
mount so that the drum aund its drive system are floating on rubber.