Abridgment of patent specifications

The Abridgment of patent specifications or Patents for Inventions: Abridgments of Specifications are summaries of patents issued by the Great Britain's Patent Office, classified by subject area and indexed by subclassification. Aeronautics is Class 4. (At least, it was from 1898 through 1915 or 1921.)

These seem to be a little difficult to track down.

Aeronautical Journal, January, 1898, p. 23 lists Abridgments of Patent Specifications No. 4. Aeronautics, 1884–88 under Recent Publications, commenting:

This series of abridgments on all subjects, at popular prices (1s.), forms a most desirable aid to the inventor searching to ascertain the novelty of his invention.
The patent laws of this country make no provision for an official search as regards novelty, and all patents are taken out at the risk of the inventors. It is therefore incumbent on any person desiring to obtain a valid patent for an invention either to cause a search to be made, or himself to make a search, as to the novelty of his invention.

Abridgments of Specifications, Class 4, Aeronautics, Period—A.D. 1909–15

See also Brewer and Alexander, 1893, Aeronautics, which uses a similar format but was not published by the Patent Office itself.