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

9.2 Design of the Multiple Head Unit
5" 22,500
6" 18,500
lX-5
Photograph 2-a and Drawing C-5-2014 show the two end bearing blocks.
It will be noted that an upper corner on each block (on the same side)
is cut off at an angle of 45 degrees. This 45 degrees cut provides a
face for mounting the multiple head unit as shown in Drawing C-5-2014.
The multiple head is mounted at an angle of 45 degrees so that the gap
between the head and the drum may be seen more easily by the observer.
A lamp placed behind the multiple head unit can provide a background of
light so that a gap of only one or two thousandths of an inch betvi/een the
drum and head can be easily observed by the operator, '^he 45 degree angle
also enables the operator to place himself in a convenient position
while adjusting the gaf) bet'.veen the drum and the head.
Drawing ^^-5-2014 shows one station of the 44 channel multiple head.
A description of this one head will apply to all since all are alike.
The head on which the fine, one mil wire is mounted is made of bakelite.
The bakelite head is mounted on a rigid alumintim mounting bar for two reasons:
1.
Tq reduce the vibration of the heads.
2. To provide a means of adjusting the gap between each
head and the drum.
As can be seen in the drawinj^, the aluminum bar has a deep round bottomed