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Many of the types and
packaging styles of batteries of yesterday are nothing like those of today. Back
then, a lot of battery packages had square corners, whereas nowadays they tend
to be round. The individual cells inside the "square" batteries were usually
round, however, because rather than using heat shrinkable tubing to hold the
entire parallel and/or series groupings together, they were inserted into
rectangular cardboard boxes. Being free to shift around in the box made
inter-cell connections vulnerable to vibration and shock, so failure rates were
higher than experienced now in tightly restrained cells in shrink tubing.
Inter-cell connection failure was a big problem with model airplanes when
batteries contained in boxes were subject to sometimes violent vibration coming
from rough-running engines - often augmented by a poorly balanced propeller. To
make matters worse, in the very early days of model aviation, "wet" cells of the
lead-acid types were used to provide high power needed for vacuum tube
receivers. In a crash or hard landing (often indistinguishable from one
another), the battery cases would break allowing acid to get on electronics and
wood.
National Union Batteries
 N. U. Batteries
By the Carload!
Get Immediate Deliveries of All Types for Standard Radio and Other Replacements
Now you can bring many thousands of good, serviceable battery - powered radio
sets back to life. Portables - Farm Radios - "carryabout" sets! Here are the batteries
you need to bring in this flood of profitable service and parts business. Order
now and tell your customers to come on the run for the batteries they need.
In batteries as in other products, N. U. quality helps you build for the future.
The patented construction of N. U. Batteries permits more active materials - more
service hours per dollar. Every N. U. Battery is engineered to the highest initial
equipment standards and is designed for universal replacement.
Place Your Battery Order Today - with Your N. U. Distributor
Renew with N. U. ... the quality line that brings repeat sales at full profit
to radio service men !
National Union Radio Corporation, Newark 2, New Jersey
National Union Radio Tubes and Parts
Transmitting, Cathode Ray, Receiving, Special Purpose Tubes, Condensers, Volume
Control, Photo Electric Cells, Panel Lamps, Flashlight Bulbs
Posted August 10, 2022
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