Todays patent was Kapferer’s only American LTA patent.
“Hitherto, the attachment of the fabrics 7, 9, 11 and 12 around
the cords 17 and 18 has been effected by a lacing comprising
a cord passing through a suitable number of metal eyelets fixed
to the boltropes of these fabrics. Further, the internal suspension
ropes 15 passed through the lower edge by being
threaded through suitable metal parts.
Owing to this method of assembling, the lacing eyelets and the
metal parts through which the suspension ropes passed, were in
contact with the gas in the envelop and were rapidly oxidized,
and they corroded the lacing cords of the edge of the envelop.
The present invention has now for its object to remedy these
various drawbacks, and it consists substantially in a system of lacing
the several fabrics connected to the lower edge of an airship with
internal suspension, wherein no medal part is in contact with the
gas in the envelope.”
NOTE: The Astra-Torres, three-lobed blimp was one of the more
successful non-rigid airship designs in the early 20th century.
Kapferer’s invention was a solution to what was apparently one
of its primary failure mechanisms; corrosion caused by exposure
to hydrogen, or other lifting gases. N.B. The patent doesn’t
mention any means of sealing the junctions between the various
The USPTO might also have assigned:
244/125 (Airship hull construction), and
244/126 (Airship skin construction).