Each of these booklets represents the public notice of patents granted by Royal decree or those held as Provisional. Each is with blue paper cover and was printed at the Great Seal Patent Office, 25 Southampton Buildings, Holborn and printed by George E. Eyre and William Spottiswoode. A collection of rarely seen booklets which describe the intense work by inventors to make incremental improvements in the map making process.

1) A.D. 1810 - No. 3307. Specification of Peter Stuart. Engraving and Printing Maps, 1856. 4pp.
2) A.D. 1854 - No. 133., Specification of Joseph William Schlesinger. Facilitating Discovery of Names on Maps, Charts, and Plans., 1854. Use of tape - this device used in the famous "Tape Indicator" maps of London. This is a Provisional Specification. 1pp.
3) A.D. 1855 - No. 1495. Specification of Joseph August Mignon. Maps, Plans, Charts, & c., 1856. Method of introducing more detail into maps. Another Provisional Specification. 2pp.
4) A.D. 1855 - No. 2105. Specification of John Joseph Halcombe. Obtaining Skeleton Maps., 1856. Method of making maps by pricking outlines through a stencil. 2pp.
5) A.D. 1857 - No. 912. Specification of Francois Auguste Laurecisque. Maps or Charts., 1857. Provisional Specification for Method of making dissected maps with superimposed layers of wood, cardboard, etc. 4pp with large folding patent drawing.

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Condition: A

Contents are very good to fine. The blue covers are mostly very good but a couple have light edge toning.