In the ROTARY SWITCH shown, S3A-6 refers
to
switch S3, the rear of the wafer, (looking in
from the rear) solder lug No . 6.
ROTARY SWITCHES are viewed from the rear and the pins are numbered in a counterclockwise
manner.
FUSE AND FUSEHOLDER
The fuse has been assigned the reference designation, Fl, while the fuseholder is denoted by
XFl.
HARDWARE
Hardware is a general term for mechanical parts used in the assembly of kits . Such items
are usually screws , nuts and washers. Machine screws are sized in accordance with the diameters
of the threaded portion (No. 2, No.
4,
No. 6) , with the smaller number denoting the smaller dia
meter. The second number indicates the number of threads to an inch.
Thus� a No . 6- 32 screw has a No. 6 diameter with 32 threads per inch. The final number
indicates the length of the threaded portion. A No. 6-32
x
3/8 screw has a 3/8" long threaded
portion.
EXAMPLE:
SCREW HEADS
Binding Head
..
i
No.
6-32
x
3/16
Round Head
Per Inch
Diameter
Set Screw
(Headless)
I
3
SCREW THREADS
Machine
Self-Tapping
Flat Head
Round Head
i 9
