HENRY SOTHERAN & CO., 140, STRAND, W.C., AND 37, PICCADILLY, W. 305 



5977 [BARLOW (Peter, F.R.S.)] ASTRONOMY (Encyclopaedia Metropolitana), with 10 plates, 4to. 

 unbound, 2s [1822] 



5978 _ ANOTHER COPY : also, ex eadem [Herschel (Sir J. F. W., F.R.S.)] PHYSICAL ASTRONOMY, 

 plate: [Kater (Capt. Henry, F.R.S.)] NAUTICAL ASTRONOMY, 2 plates 3 vols. 4to. in 1, hf. cl., 

 5s [1822-3] 



5979 On the EFFECTS produced in the RATES of CHRONOMETERS by the Proximity of Masses of 



IRON, with plate, 4to. (pp. 31), sewn, 3s 60? 1821 



5980 [ ] ELECTRO-MAGNETISM (Ency. Metrop.), with 5 plates, 4to. unbound, 2s [1824] 



5981 - ANOTHER COPY, also, ex eadem [Lunn (Francis, pr., F.R.S.)] ELECTRICITY, 5 plates: 

 [Roget (P. M., M.D., F.R.S.)] GALVANISM, plate 3 vols. 4to. in 1, hf. cl., 5* [1824-6] 



5982 - ESSAY on MAGNETIC ATTRACTION, and on the LAWS of TERRESTRIAL and ELECTRO-MAG- 

 NETISM, 2nd Ed., much enlarged, with 6 plates by Lowry, 8vo. hf. calf (SCARCE), 12,$ Qd 1823 



5983 ANOTHER COPY, sewn (alightly water -stained, and name cut off title], 8s Qd 



5984 ANOTHER COPY, with APPENDIX, containing the EXPERIMENTS made on SHIP BOARD 



from Lat. 61 S. to Lat. 80 N., with 6 plates, 8vo. cl., uncut (fresh copy), 18s Qd 1824 



' Giving the details of his experiments to devise a remedy for the large deviations of the compass dne to the increasing 

 quantities of iron used in the construction and fittings of ships, and describing a simple method of correcting ships' 

 compasses by fixing a small iron plate in such a position as to compensate all other attractions. ... In the second 

 edition he succeeded in connecting the whole of his experimental results by a mathematical theory based on a few simple 

 assumptions '. D. N. B. The author was moreover the first to notice the fact that the strength of the electric current is 

 the same in all places of the conduit a discovery which enabled Ohm to formulate his ' Law '. 



5985 ESSAY on the STRENGTH and STRESS of TIMBER, founded on Experiments, with Historical 



Review of former Theories and Experiments, and Appendix on the Strength of Iron, and other 

 Materials, 3rd Ed., corrected, with 6 folding plates on copper, 8vo. boards, uncut (SCARCE), 12s 1826 



'Barlow's merits were first rendered conspicuous by the publication of an Essay on the Strength of Timber, supplying 

 as the results of numerous experiments in Woolwich Dockyard, much-needed data for the calculations of engineers. 

 The experiments on the resistance of iron which formed the basis of the design for the Menai suspension bridge were 

 submitted by Telford to his examination, and were printed as an appendix to the third edition [the above] of his 'Essay ' 

 (1826).' D.N. B. 



5986 [ ] GEOMETRY (Ency. Metrop.), with 6 plates, 4to. unbound, 2s [1825] 



5987 ANOTHER COPY, hf. cl., 3s 



5988 [ ] HYDRODYNAMICS (Ency. Metrop.), with 11 plates, 4to. unbound, 2s [1818-22] 



5989 - - ANOTHER COPY, hf. cl.,'3s 



5990 [ ] MECHANICS (Ency. Metrop.), with 10 plates, 4to. unbound, 2s [1818] 



5991 ANOTHER COPY, hf. cl., 3s 



5992 - NEW MATHEMATICAL and PHILOSOPHICAL DICTIONARY, comprising the Terms and Prin- 

 ciples of Pure and Mixed Mathematics, with Historical Sketches, and the Discoveries and 

 Writings of the most Celebrated Authors, with 13 plates, and numerous diagrams, thick roy. 8vo. 

 calf, 6s Qd 1814 



5993 - ANOTHER COPY, hf. calf (Joint cracked), 5s Qd 



Containing an interesting article on AEROSTATION, with a plate illustrating a balloon filled and in the process of filling. 



5994 NEW MATHEMATICAL TABLES, containing the Factors, Squares, Cubes, Square and Cube 



Roots, Reciprocals, and HYPERBOLIC LOGARITHMS, of all Numbers from 1 to 10,000 ; Tables of 

 Powers and Prime Numbers ; an extensive Table of Formulae, or General Synopsis of the most 

 important Particulars relating to the Doctrines of Equations, Series, Fluxions, etc. etc. etc., first 

 edition, 8vo. boards, uncut (SCARCE), 12s 1814 



'A vast mass of accurate and highly useful information.' D. N. B. 'Unprecedented both for their extent and 

 accuracy.' Prof, de Morgan. 



5995 [ ] OPTICS (Ency. Metrop.), with W plates, 4to. unbound, 2s [1819-23] 



5996 ANOTHER COPY, hf. cL, 3s 



5997 [ ] PNEUMATICS (Ency. Metrop.), with 13 plates, 4to. unbound (one plate wanting], 

 \s Qd [1823] 



5998 - On the PROBABLE ELECTRIC OEIGIN of all the Phenomena of TERRESTRIAL MAGNETISM, 

 4to. (pp. 12), sewn, with author's inscr., 5s 1831 



'Describing an ingenious experiment (strikingly confirmatory of Ampere's theory) showing the precise similarity 

 between the action of the earth on the magnetic needle and that of a wooden globe coiled round with copper wire carrying 

 a galvanic current.' D. N. B. 



5999 - TABLES of SQUARES, Cubes, Square Roots, Cube Roots, and Reciprocals of all Integer 

 Numbers up to 10,000 [with Preface by AUGUSTUS DE MORGAN], post 8vo. cl., or, hf. calf, 

 3s Qd 1840 



A reprint of the larger portion of the New Mathematical Tables (q. v. supra) in a specially readable type. 



6000 On the TEMPORARY MAGNETIC EFFECT induced in IRON BODIES by ROTATION, plate, 

 4to. (pp. 13), unbound, 3s 1825 



6001 - TREATISE on the MANUFACTURES and MACHINERY of GT. BRITAIN, with View of the 

 Principles ot Manufactures by CHARLES BABBAGE, F.R.S., with 87 steel plates, comprising 650 

 figures of machinery and tools, thick 4to. new hf. buckram, 12s Qd 1836 



Including an account and illustrations of ' Locomotive Engines for Rail Roads and Common Roads ' 



6002 - - TREATISE on the STRENGTH of TIMBER, CAST and MALLEABLE IRON, and other Materials; 

 with Rules for Application, and Appendix on the POWER of LOCOMOTIVE ENGINES, etc. ; new Ed. 

 by J. F. HEATHER, with Essay on the Effects produced by causing Weights to travel over Elastic 

 Bars, by ROBERT WILLIS, pr., F.R.S., with 9 folding plates, and woodcuts, 8vo. hf. morocco gilt, 

 7sQd 1851 



Constituting the fifth edition of the 'Essay on the Strength' etc (q. v. siipra). It is interesting as containing invest- 

 igations by Prof. Willis in another field than that in which he is best known-the growth and theory of Mediaeval 

 Architecture. 



