Improvements in Electric Condensers."
Year: 1898

page_text: Date of Application, 10th May, 1898-Accepted, 30th July, 1898
COMPLETE SPECIFICATION.
Improvements in Electric Condensers."
I, CHARLES SCHENCK BRADLEY, a resident of Avon, County of Livingston, State
of New York, United States of America, Electrical Engineer, do hereby declare
the nature of this invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:.
This invention relates to electric condensers, the object being to provide a
condenser, a greatly increased capacity bulk for bulk as compared with the con-
densers as commonly organized. I carry out the invention by using as a dielec-
tric stearate of lead, which I have ascertained has a specific inductive capacity
much greater than paraffine, wax or other materials heretofore employed as a
dielectric in condensers. Pure stearate of lead free from water and deleterious
mixtures has a specific inductive capacity of 74 to 1 as compared with air and
offers a great resistance to puncture. This material may be used in any convenient
way for separating the several condenser plates.
In the accompanying drawings is illustrated one form of construction found
convenient in practice. In order to reduce the compass of the condenser as much
as possible, it is desirable to employ thin films of the dielectric. It is important
also to prevent short-circuiting by accidental contact of opposite plates. This
end is attained in the type shown by using between the several plates sheets of
open-work fabric, such as mosquito-netting, the dielectric material being rolled
into the meshes of the netting and over the same to the desired thickness either
before or after applying the same to the plate. By such a construction the main
part of the separating medium is of high specific inductive capacity thereby ren-
dering the average specific inductive capacity of the total dielectric high. After
a sufficient number of plates have been assembled to form a condenser of the
desired capacity the whole may be brought to a proper temperature to soften the
stearate of lead and submitted to pressure so as to bring the plates into close and
uniform relation to one another.
Having now particularly described and ascertained the nature of this invention,
and in what manner the sanie is to be performed, I declare that what I claim is:-
1. An electric condenser having as a dielectric stearate of lead.
2. An electric condenser having between its several plates a layer of stearate of
lead of uniform thickness.
3. An electric condenser having its several plates separated by a fibrous insulat-
ing material, the pores and meshes of which are filled with stearate of lead.
4. An electric condenser having its several plates separated by a netting of
insulating material.
5. An electric condenser having between its several plates a spacing insulating
material having a plurality of transverse openings.
6. An electric condenser having between its several plates a spacing insulating
material containing a plurality of transverse openings filled with a material of
077

page_text: higher specific inductive capacity whereby part of the interspace between the plate
is filled solely with the latter material.
7. An electric condenser having between its several plates a spacing insulating
material having a plurality of transverse openings filled with stearate of lead.
1
10
1
D 1000
BOULT & WADE,
Agents for the Applicant.