BECKER BECKER NOW READY. ILLUSTRATED CATALOGUE OF PHYSICAL APPARATUS, COVERING SOUND, LIGHT, HEAT, MAGNETISM, "NATURE" says: "The new illustrated catalogue of physical apparatus just issued by Messrs. F. E. Becker and Co. (Messrs. W. and J. George, Ltd.) is likely to prove indispensable in the physical laboratories of all our schools and colleges. It runs to 628 large pages, and is strongly bound in cloth. Full particulars are provided, not only respecting the apparatus required in elementary and advanced physical teaching, but also concerning that necessary to the physicist in his research work. All branches of physics are included, and the instruments throughout are explained by excellent illustrations and concise descriptions, and, what is of prime importance, the figure and its appropriate text are close together." "CHEMICAL NEWS" says: “Messrs. F. E. Becker and Co. (W. and J. George, Ltd., successors) have just issued a new Illustrated and Descriptive Catalogue of Physical Apparatus, &c., manufactured by them. This is the largest and best English catalogue of its kind printed, and comprises some 630 pages and over 4,000 illustrations; herein will be found all the newest up to date apparatus with all the latest improvements as manufactured at their works, while all obsolete apparatus has been omitted. The whole catalogue is arranged in a very clear manner under a number of principal headings, such as Magnetism, Heat, Sound, Light, Mechanics, Electricity, Pneumatics, Meteorology, X-ray Apparatus, &c., and a good index is provided; in fact, everything possible has been done to make this as perfect a guide as possible to users of apparatus in the subjects touched upon.' "Messrs. F. E. Becker and Co. (W. and J. George, Ltd., Successors) have sent us a copy of their new list of apparatus in the various departments of Physics, including Sound, Light, Heat, Magnetism, Electricity, Mechanics, &c. This exhaustive catalogue consists of over 600 pages and some 4000 illustrations. One of its noteworthy features is that the requirements of science teaching in this country and its colonies are always kept in view, and the articles listed cover the latest developments in their subjects. The method adopted in the list itself, together with the completeness of the index, is such as to make reference to it simple and expeditious." SCHOOL WORLD" says: "The science-master in every grade of school should possess a copy of the new catalogue of Messrs. George, for he will find here particulars as to the available apparatus in sound, light, heat, magnetism, electricity, mechanics, and other branches of physics, with information as to price and other necessary details. There is a profusion of welldrawn illustrations, which, together with the clearly expressed descriptions, will serve to explain to any buyer exactly what he is purchasing. This, excellent catalogue will form a valuable addition to the reference library of any physical laboratory." Ltd N.W BECKER LONDON RECORDING PYROMETERS. AN ELECTRICAL RESISTANCE THERMOMETER, in combination with a Callendar Electric Recorder, forms a most convenient and accurate Recording Pyrometer. These instruments work without photography, the record being always open to nspection; they are entirely free from pen friction error. The illustration is produced from an annealing-turnace record obtained in this way, and shows quite clearly the change in the management of the furnace when one fireman (A) was relieved by another (B). Full particulars will be forwarded free on application. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LTD. Works & Head Office: CAMBRIDGE, ENGLAND, where all correspondence should be addressed. LONDON SHOWROOM: 92 HATTON GARDEN, LONDON, E.C. THE BLACK AUTOCOPYIST Selenium Cells "No Better Food."-Dr. ANDREW WILSON, F.R.S.E., &c. Fry's PURE LONDON, E.C. CONCENTRATED Cocoa, RICHARD CLAY AND SONS, LTD., BREAD ST. HILL, E.C, AND BUNGAY, SUFFOLK. THE NEW BOOK PRICE ONE SHILLING. Containing an original description of the principles and function of the photographic lens. Together with the latest workshop methods. Then there follows a series of chapters on practical photography and the effect of lenses on results. The chief types are discussed and compared by means of original diagrams. Also an appendix on the Gauss Theory and on a new system of lens testing. The book is entitled "PHOTOGRAPHIC LENSES: A SIMPLE TREATISE." 350 Pages, 45 Engravings, 150 Diagrams, Cloth Bound. CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS. NEGRETTI & ZAMBRA'S UNIVERSITY OF WALES. MATRICULATION EXAMINATION, 1905. The University Court will shortly appoint MATRICULATION EXAMINERS as follows:- SUBJECTS. English Language and the History of England and Wales ... PRESENT EXAMINERS. Professor A S. NAPIER, M.A., Litt. D., The Rev. T. A. WALKER, Litt.D., (*G. B. MATHEWS, M.A, F.R.S. J. H. GRACE. M.A. E. SEVMER THOMPSON, M.A. *W. E. JORDAN, M.A. The Rev. ROBERT WILLIAMS, M.A. Professor E. Wɛɛkley, M.A. *T. BAILEY SAUNDERS. M.A. W. C. D. WHETHAM, M.A., F.R.S. and W. C. D. WHETHAM, M.A., F.R.S. *F. D. CHATTAWAY, M.A., D.Sc., Professor M. C. POTTER, M.A. The Examiners whose names are marked with an * have served for the full period of five years. Particulars will be given by the REGISTRAR of the University, University Registry, Cathays Park, Cardiff, to whom applications must be sent on or before January 7, 1905. JAMES, Botany Zoology... ... J. F. MACKENZIE, Ph.D., D.Sc. ALBERT GRIFFITHS. D.Sc. D. OWEN, B.A., B.Sc. B. W. CLACK, B.Sc. E. H. SMART, M.A. W. G. BIRT, B.A., B.Sc. A. B. RENDLE, M.A., D.Sc. F. E. FRITSCH, Ph.D., B.Sc. Calendar 6d. (post free 8d.), on application to the SECRETARY. Registrar of the University. CITY OF LONDON COLLEGE. TECHNICAL Manresa Road, Chelsea, S.W., Day College Courses of thirty hours per week are conducted in preparation for the London University Degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemistry, Physics and the Natural Sciences. The composition fee for the Session of three terms, 1904-1905. is £15. These Courses are recog nised for "Internal Students of the University, and consist of lecture and laboratory instruction. The Courses are conducted by :MECHANICAL ENGINEERING, W. W. F. Pullen and L. D. Coues'ant; ELECTRICAL ENGINEERING, A. J. Makower; CHEMISTRY, J. B Coleman, J. C. Crocker, and F. H. Lowe; MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill; GEO. LOGY, A. J. Maslen. In the evenings similar Courses will be conducted, but at £2 per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for the Engineering, Electrical and Chemical ard Metallurgical professions. The Laboratories and Workshop are open for RESEARCH under the direction of the Principal and the Heads of Departments. Further particulars may be obtained on application to the SECRETARY, who will send either the Day College Prospectus and Calendar or the Evening Class Prospectus for 3d. The Prospectus may be had at the Office for id. A CHRISTMAS COURSE OF LECTURES. ROYAL INSTITUTION OF ALBEMARLE STREET, PICCADILLY, W. HENRY CUNYNGHAME, Esq., C.B., M.A., M. Inst. E. E., will on TUESDAY next, December 27, at Three o'clock, begin a Course of Six Lectures (adapted to a Juvenile Auditory) on "ANCIENT AND MODERN METHODS OF MEASURING TIME" (Experimentally Illustrated). Subscription (for Non-Members) to this Course, One Guinea (Children under sixteen, Half a-Guinea); to all the Courses in the Season, Two Guineas. Tickets may be obtained at the Institution. WHITE ST., MOORFIELDS, E.C. (Near Moorgate and Liverpool Street Stations.) PRINCIPAL: SIDNEY HUMPHRIES, B.A., LL.B. (Cantab.) EVENING CLASSES in ALL BRANCHES of SCIENCE. Well-equipped LABORATORIES for Practical Work in CHEMISTRY, BIOLOGY, BOTANY, GEOLOGY, and all branches of PHYSICS. Special Courses for London University Matric., Inter., and Final B.A., SATURDAY COURSES for Matric., Inter., and Final B.A., B.Sc. Prospectuses, and all other information, gratis on application. DAVID SAVAGE, Secretary. YOU Illustrated Booklet post free. THE YOST TYPEWRITER CO., LD., HEAD OFFICE: 50, HOLBORN VIADUCT, LONDON, E.C. Branches in all large towns. EXCELLENT Photographs in Colour are obtained with our smaller lens filter Outfits, complete from 25/-; but for general work, Landscapes in changing light, Portraiture or Photomicrography where rapid exposures in succession are necessary, the Repeating Back with Colour Filters is recommended as the best all round appliance. It may be attached to any, or whole-plate camera or glass plate Kodak, by means of a panel cut to correspond and interchangeable with the ordinary dark slide. This does not in any way interfere with the use of the camera for ordinary work. The three Colour Filters are held in a frame, clipped in front of the double dark slide which carries the two plates, each large enough to record the three negatives side by side, when the slide is pushed With this Outfit, even a past the opening in the outer case. beginner will secure three-colour negatives with the ease and certainty of an ordinary photograph. Repeating Back Attachments, with Filters complete, from 90/Send for New Booklets, post free to readers of "Nature," or call and see results obtained by amateurs. SANGER-SHEPHERD & CO., 5, 6, 7 Gray's Inn Passage, Red Lion St., Holborn, London. |