528 HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 



10610 LAW (Henry, M.I.C.E.), and George Rowdon BTJRNELL, C.E. : The RUDIMENTS of CIVIL 

 ENGINEERING, including HYDRAULIC ENGINEERING, with plates and numerous woodcuts, 4 v. : 

 Olynn (Joseph, F.R.S.) RUDIMENTARY TREATISE on the POWER of WATER, 49 woodcuts 

 vols. fcap. 8vo. in 1, hf. morocco gilt, with auto, of Prof . Hilary Bauerman, 5s 1852 & 



Pp. 16-69 of v. II comprise' Rail way Engineering. 



10611 - PARTS I AND II (CiviL ENGINEERING) ONLY, with plates, and numerous woodcuts, 2 

 parts, 1852 : RUDIMENTS of the ART of CONSTRUCTING and REPAIRING COMMON ROADS, with 

 General Survey of the principal Metropolitan Roads by S. HUGHES, with 21 woodcuts, '50 : 

 Dempsey (O. Drysdale, C.E.) TUBULAR and other IRON GIRDER BRIDGES, particularly the 

 BRITANNIA and CONWAY TUBULAR BRIDGES, with front, and 41 woodcuts, '504 vols. fcap. 8_vo. 

 in 1, hf. morocco, 5s 1850-2 



10612 SEVENTH [LAST] EDITION of the Rudiments,' with large Additions by D. KINNEAR 



CLARK, M.I.C.E., and TREATISE on HYDRAULIC ENGINEERING by GEORGE ROWDON BURNELL, 

 M.T.C.E., with front, and 322 illustrations, thick fcap. 8vo. cl., 3s Qd 1882 



10613 LAWN (James Gunson, A.M.I.C.E.) MINE ACCOUNTS and MINING BOOK-KEEPING, 3rd 

 Edition, roy. 8vo. cl. t 5s (p. 10* Qd) 1904 



' It seems impossible to suggest how this book could be made more complete or more valuable.' Accountants* 

 Magazine. 



10614 LAWSON (Henry, F.R.S.) A Few OBSERVATIONS on the NEW PLANET [NEPTUNE], and the 

 Circumstances connected with its Discovery, with folding plate, 8vo. (pp. 4), sewn, ivith inscr. to 

 Prof. Story Maskdyne, F.R.S., 3s Qd 1847 



10615 PAPER on the ARRANGEMENT of an OBSERVATORY for PRACTICAL ASTRONOMY and 



METEOROLOGY, with 5 folding plates, impl. 8vo. (pp. 20), cl., with inscr. to Prof. N. Story 

 Maskelyne, F.R.S. (scarce), 10s Qd [privately printed, Bath], 1844 



Describing his invention of the observing chair ' Reclinea' and a new thermometer stand, for which he was awarded a 

 silver medal by the Society of Arts. 



10616 LAWSON (John; Sidney Sussex Coll., Cantab. ; Rector of Swanscombe] SYNOPSIS of all the 

 DATA for the CONSTRUCTION of TRIANGLES, from which Geometrical Solutions have hitherto been 

 in Print, with Reference to the Authors where those Solutions are to be found, 4to. (pp. 24), 

 sewn, 5s Rochester, 1773 



10617 LAWTON (J.) A DESCRIPTION of LAWTON'S PATENT LOCK, which has been proved to be 

 SECURE AGAINST FALSE KEYS and PICKS of every Description; also a few familiar Hints 

 respecting the Necessity of using secure Locks, with 2 folding plates, roy. 8vo. sewn (scarce], 

 10* Qd 1825 



This should have been a very fair lock, as it anticipated the lever lock in having three tumblers which had to be raised 

 exactly to the right height ; while it added the principle of a curtain which advanced and covered the keyhole while the 

 key and bolt were in motion. It remained unpicked for seven years under the stimulus of a hundred pounds' reward, 

 and earned the compliment of a prisoner in Ilchester gaol who was invited to give an exhibition on it before the County 

 Magistrates : ' It is one of them damned curtain locks if it had not been for them I should not have been here now ! ' 



10618 LAYBIZ (Lt.-Col. Otfried, German Army) MECHANICAL TRACTION in WAR for ROAD 

 TRANSPORT, with Notes on AUTOMOBILES generally, trans, by ROBERT BRIGHT MARSTON, with 

 numerous plates, roy. 8vo. cl., 3s (p. 5s nett) 1900 



Including interesting chapters on the history of the subject. 



10619 [LEA (W.)] PROBLEMS in some of the HIGHER BRANCHES of ALGEBRA, 4to. (pp. 57), sewn, 

 6s Qd 1807 



The author claims to have 'deduced a general theorem for solving biquadratic equations. 1 



10620 TREATISE on the RESOLUTION of the HIGHER EQUATIONS in ALGEBRA, 4to. (pp. 48), 



sewn, 5s Qd 1811 



' My chief design in the present work is to reduce to one several of the various and apparently independent methods, 

 which have at different times been proposed to resolve equations.' Preface. 



10621 LEA (William) TABLES of the STRENGTH and DEFLEXION of TIMBER, with front, and 9 

 diagrams, post 8vo. cl., 2s Qd (p. 105 Qd) 1850 



10622 LEADBETTER (Charles ; gauger in the Excise] The ROYAL GAUGER ; or GAUGING made 

 PERFECTLY EASY, as practised by the Officers of Excise, containing the Practical Methods of 

 finding the Areas, etc. etc., performed by the Pen and SLIDING RULE, etc. etc., to which is added 

 Cask-Gauging, etc. as practised in the Port of London ; 6th Edition, augmented and improved by 

 SAMUEL CLARK, with plate of sliding rule, and 6 other folding plates on copper, 8vo. old calf, 

 newly rebacked (partly water-stained], Is Qd 



10623 SEVENTH EDITION, with 1 folding plates, 8vo. old sheep, Is Qd 1776 



10624 URANOSCOPIA : or, the Contemplation of the Heavens : a Demonstration of the Equation 



of Time, with the Method of observing Solar Ingresses into any Point of the Ecliptic, etc. etc. 

 etc., with numerous diagrams, 8vo. old calf, 4s 1735 



' Leadbetter was one of the first commentators on Newton, and his writings were useful in their time.' D.N.B. 



10625 LEASES of CATHEDRAL-CHURCHES and COLLEGES, TABLES for RENEWING and PURCHASING 

 of the : according to several Rates of Interest, with their Construction and Use explain'd, also 

 Tables for Renewing and Purchasing of Lives, etc. etc. ; 5th Edition, 8vo. (pp. 72), sewn, 5s 1735 



The sinecurist's guide in seeking after leasing. 

 The above pamphlet was unknown to Watt. 



10626 LEATHEM (John Gaston, St. John's College, Cantab.) VOLUME and SURFACE INTEGRALS 

 used in PHYSICS, 8vo. sewn, Is Qd (p. 2s Qd nett) Univ. Press, Cambridge, 1905 



10627 LEBESGUE (V. A.) THEOREMES NOUVEAUX sur 1'EQUATION Inde'termine'e x 5 + y 5 = az 5 , 4to. 

 (pp. 22). sewn, 2s 1843 



10628 LE BLANC (Max, Univ. Leipzig) TEXT-BOOK of ELECTRO-CHEMISTRY, translated from the 

 4th German Edition by W. R. WHITNEY and J. W. BROWN, with 51 woodcuts, 8vo. cl., Qs Qd 

 (p. 10s Qd nett) 1907 



