574 HENRY SOTHERAN & CO., 140, STRAND, W.C., and 43, PICCADILLY, W. 



MASKELYNE (Nevil, pr., f.r.s.. Astronomer Royal) Account of the Going of Mr. John 

 Harrison's Watch (1767)— v. No. 8970, ante. 



11541 Account of the Principles on which the following Comparative Tables of English 



with French Measures and Weights have been constructed : a Manuscript neatly written on 

 7 pages, 4to. sewn, lOs Qd 1800 



This marmscript formed part of the library of Dr. Xovil ^faskelyne, and was probably written from his dictation. 



11542 An Answer to a Pamphlet entitled 'A Narrative of Facts', lately published by 



Mr. Thomas Mudge, Jr., relating to some Time-Keepers constructed by his Father Mr. 

 Thomas Mudge, wherein is given an Account of the Trial of his First Time-Keeper, and of the 

 Three Trials of his .Two other Time-Keepers, 1774-90, and also the Conduct of the Astronomer 

 Royal, and the Resolutions of the Board of Longtitude, are vindicated from Mr. Mudge's Mis- 

 representations, 8vo. seivn (rare), lOs Qd 1792 



Thomas Mudge, as well as John Harrison, accused Dr. Maskelyne of partiality and undue severity in testing their 

 time-keepers with a view, as they thought, to advance his own imperfect method of finding the longitude by lunar 

 distances only. See Harrison*, Nos. S965-6 and SP70, ante, and Mudge, post. 



11543 Another Copy, roy. 8vo. boards, uncut, 12s 6d 



The above copy belonged to Samuel Horsley, F.R.S. , Bp. of St. Asaph, and bears the inscription ' From the Author 

 in Dr. Maskelyne's handwriting. 



11544 Concerning the Latitude and Longitude of the Royal Observatory at Green- 

 wich ; with Remarks on a Memorial o^ the late M. Cassini de Thury, 4to. (pp. 39), sewn, with 

 author's inscr., 4tS 1787 



11545 Another Copy, with Roy(Major-Gen. William, f.r.s.) Account of the Mode pro- 

 posed to be followed in Determining the Relative Situation of the Royal Observatories 

 of Greenwich and Paris, withfoldinj map and 2 folding tables— in one vol. 4to. (pp. 76), sewn, 

 6s 1787 



On a Difficulty in the Theory of Vision— v. No. 9196, ante. 



11546 Instructions relative to the Observation of the Ensuing Transit of the Planet 



Venus over the Sun's Disk, on the 3rd of June, 1769, with 3 tables, sm. 8vo. (pp. 44), seton, 5s 1768 



11547 A Plan for Observing the Meteors called Fire-Balls, folio (pp. 3), unbound. 



Is 6d [1783] 



11548 — Remarks on the [sic] Hadley's Quadrant, tending principally to remove the Diffi- 

 culties which have hitherto attended the Use of the Back-Observation, and to obviate the 

 Errors that might arise from a Want of Parellelism in the Two Surfaces of the Index-Glass, 4to. 

 (pp. 24), sewn, 8s 6d 1772 



11549 [- ] Tables requisite to be used with the Nautical Ephemeris, for finding the 



Latitude and Longitude at Sea, published by Order of the Commissioners of Longitude, 3rd Ed., 

 corrected and improved, roy. 8vo. hf. maroon (rubbed), 5s 1802 



The last edition of the author's ' Requisite Tables ', which were first published with the first volume of the Nautical 

 __ Almanac in 17116. At end is ' The Explanation and Use of the Tables ' (pp. 57). 



11.550 : Harrison (John ; ' Longitude Harrison') Remarks on a Pamphlet lately published 



by the Rev. Mr. Maskelyne, under the Authority of the Board of Longitude, 8vo. (pp. 34), 

 sew7i, Is Qd 1767 



11551 MASONRY (Practical), Bricklaying, and Plastering, both Plain and Ornamental; 

 containing a New and Complete System of Lines for Stone- Cutting ; with the Theory and 

 Practice of Constructing Arches, Domes, Groins, Niches, Stairs, Columns, etc. etc. etc., and 

 Practical Treatises on Slating, Plumbing, Glazing, etc., etc., tcith 60 plates, 4to. hf. morocco, 

 &s 6rf 1847 



11552 MASTEKSON (Thomas): Thomas Masterson his First Booke of Arithmeticke, 

 shewing the ingenious Inuentions, and hguratiue Operations, by which to calculate the true 

 Solutions or Answerea of Arithmeticall Questions : after a more perfect, plaine, briefe, well 

 ordered Arithmeticall Way, then any other heretofore published ; verie necessarie for all Men : 

 His Second Booke of Arithmetick ... no lesse pleasant and profitable to those which are 

 given to be Marchants, than to others : His Addition to his First Booke of Arithmetick, 

 shewing the true vnderstanding of the same booke, with the Examples therein, declared at large : 

 also how the Solutions of the Questions propounded in his second Booke may be calculated 

 by the said first Booke many seuerall Wayes, with vignette on title, 3 vols. sm. 4to. in 1, 

 boards (first title and some II. soiled, a few blank top corners worn away, and somewhat water- 

 stained throughout, but on the whole a sound copy) ; very rare, £5. 5s 



Richard Field, dwelling in the Blackfriers neare Ludgate, 1592-4 

 The first book and the addition are on abstract numbers and fractions : the second book is on commercial 

 *^'ii"il 'a ■ **»sterson must have been a valuable help to the student : though he would have been more so had he 

 used the modern method of division.'— Pro/, de Morgan. 



A^-^^ ^'J'^f^^'^*^^2" ^° ^^^® ^^'"^ ^^ ^^^^^ *^® author mentions that he intends to publish six books of arithmetic, the 

 <cna,nrtOth ot which were to contain ' arithmeticall questions and demaundes*. No more than three were ever 

 yupiisned. in his address ' To the Reader ' in the Addition the author inveighs against the ignorance of contemporary 

 '^"f.'l^o^a^nietic, more especially Simon Stevinus and Michel Coignet, 'both teaching (in the appearance of the 

 >insKUiuii) with great shew of truth, other answers than mine of the questions of paiments and interests, and notwith- 

 scanmng in ttiose answers they are very false : and so their followers ', etc. etc. etc. The work was unknown to Lowndes, 

 and Its author is not included in J). N. B. 



1155.3 MASTS, The Art of Making, Yards, Gaffs, Booms, Blocks, and Oars, as practised in the 

 Koyal iSavy, and according to the most approved Methods in the Merchant Service, including 

 a Description of an Improved Rule for Mast Makers, also a New Method by which Large Yards 

 may be made from Small Trees, and Repaired when Sprung in the Slings, with 3 copperplates 

 {2Jolding), and mmierous woodcuts, 8vo. old calf (rare), lOs Gd 1797 



This work was unknown to Watt and Halkett and Laing. 



