NA TURE 



[October 12, 1905 



LANTERN SLIDES 



of Scientiflo Subjects, 

 from 6/- per dozen. 



Also Hand Painted from 1/3 to 5/- each. 



Slides from Prints, Drawings, Photographs, \c„ a Speciality. 



PHOTOMICROGRAPHS. 



Storage Cabinets for Lantern Slides to hold 400, 10/6 ; 

 600, 14,6 ; 1200, 25/6. Stc List. 



MICROSCOPICAL SLIDES, S^:^St^s?fXlir.. 



FLATTERS & GARNETT, Ltd., 



48 DEANSOATE, 



And at CnuRCH Ro.^D, Longsicht, MANCHESTER. 



Accurate and 



Inexpensive. 



Descriptive 

 Pamphlet 

 Post Free. 



lllik «!ji 



Till; m:»v 



PRICE 



21/- 



'PIESMIC BAROMETER, 



F. D ARTON^ St. CO., 



CLERKEHWELL OPTICAL WORKS. 



142 ST. JOHN STREET, LONDON, E.G. 



DENTS CLOCKS, 



WATCHES. ANO CHRONOMETERS 



FOR SCIENTIFIC USE. 



Sidereal or Mean Time Cloelts for 

 Observatories, £21 and upwards. 



E. DENT & Cb., Ltd., 



VJATCH, CLOCK & CHRONOMETER MAKERS 

 By Special Appointment to H.M. the King. 



THE DECIMAL ASSOCIATION. 



OJici for all Publications : — 



605 Salisbury House, 



London Wall, E.G. 



An explanatory chart of the metric system can now 

 be obtained on application to the Secretary at the 

 above address, price 1/-. Or it can be supplied, 

 mounted on linen, fitted with rollers and varnished, 

 for 5/-. Postage is included in both cases. The 

 chart measures 112 centimetres x 61 centimetres 

 (44 ins. >: 24 ins.) 



The chart was compiled by Mr. J. G. Filter, or 

 Paris (a member of the Executive Committee), and 

 bears the written approval of Lords Kelvin, Belhaven 

 and Stenton, Avebury, Spencer, and Tweedmouth, 

 Right Hon. H. O. Arnold-Forster, Sir J. T. Brunner, 

 Sir Wm. Muggins, Sir Oliver Lodge, Sir Wm. Mather, 

 Sir G. L. Molesworth, Sir W. H. Preece, Sir. Wm. 

 Ramsay, Sir Henry Roscoe, Mr. Alex. Siemens, 

 Dr. Selwyn, Dr. Gray, Sir Samuel Montagu and 

 Mr. Dowson ; of the Chairman and some of the 

 Members of the Select Committee of the House ot 

 Commons of 1895 ; and of the President and Ex- 

 President of the Associated Chambers of Commerce 

 for the year 1897. All the signatures are reproduced 

 in fac-simile, which adds greatly to the interest or 

 the chart. 



SECOND-HAND TELESCOPES. ' 



4S-in. Cooke Equatorial, with e.xtra Altazimuth Mount, £60. 4-in. 

 Wray, Slo«- Motions complete, £30. 4-in. Wray Ordinary, £25. 

 3(-in. Browning Reflector, £15. o.i.-in. Calver ReHector, £12. 65-in. 

 Calver Equatorial, £15. l-in. Student Steward, £4 lOs. 3-in. 

 Student Solomon. £2 15s. and £3 10s. 

 SECOND-HAND MICROSCOPES. 



Watson's Edinburgh Student, complete with fittings, £15. Swift's 

 Bacteriological. £15. Beck's "London," complete, £8 lOs. Micro- 

 scopes from 20s. upwards to suit all students. 

 Many olluis, all kinds. Lists on A/>t'licatim. 



A.. cr..A.iz.i£.soi>a- ex. co., 



28 BARTLETT'S BUILDINGS. HOLBORN CIRCUS, LONDON. 



Only Addresses— 



61 STRAND, and 4 ROYAL EXCHANGE, LONDON. 



rticle 



cati( 



l;ASE-I,IMi ME.\SURINi-, AITAK.VTrs, I'EN l)U l.U MS, BALANCES 

 FOR WAICHES AM) CHRONOMETERS. 



J. H. AGAR BAUGH, 92 Hatton Garden, London, E.C. 



Telegrams: "Voider, London." Telephone; No. 4722 Holborn. 



HARVEY & PEAK, 



BY APPOINTMENT TO THE ROYAL INSTITU- 

 TION OF GREAT BRITAIN. 



POST OFFICE BRIDGE SETS AND 



DEAD BEAT GALVANOMETERS. 



POTENTIOMETERS. STUDENTS' 



SPECTROMETERS. SPHEROMETERS- 



INDUCTION COILS A SPECIALITY. 



ELECTROMETER, NEW PATTERN. 



S© CHA-Rimo CI20SS ■R.OA.n, r. O IV I> OI«J, 



