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Registered Design No. 420,297.
As will be seen by the illustration, this Barometer is built on original lines.
By the absence of the ordinary tubular enclosures (in the usual form of instrument) the mercurial column is FULLY EXPOSED to view, NO SHADOWS are thrown upon the column, and therefore an extremely accurate and instantaneous reading is made possible. The scales being graduated upon the flat side pieces the DIVISIONS AND FIGURES ARE ALWAYS IN VIEW, and the vernier is very much more legible than in the ordinary tubular patterns.
The bore of the tube is 0.5 inch.
The scales are graduated in inches and millimetres, and, by means of the verniers, are capable of being sub-divided to read to 0.002 inches and 0°1 m/m.
The attached Thermometer on the body of the instrument is graduated in Fahrenheit and Centigrade scales. It is the BOLDEST Standard Barometer made. The PRICE IS LOWER than that of any other form of Standard Barometer of the same dimensions.
It yields readings equally close as the highest priced instruments.
Price complete, mounted on handsome Polished Solid Mahogany Board, with Brackets for Suspension, and Opal Glass Reflectors,
SMALLER SIZE, "THE STUDENTS," designed for Schools for demonstration work, and small private Observatories; bore 25; reading to '01 inch and 1 millimetre. £3 7s. 6d.
Sole Manufacturers and Proprietors of the Regd. Design:
NAT. TEL.: 1981 Holborn. Estd. 150 years.
N. B. If any difficulty be found in securing any of our Instruments through your Dealer, kindly communicate with us.
Sardinia Street, London, W.C.
Measures wave-lengths direct to an accuracy of 1 Angström unit (one ten-millionth of a metre) from W. L. 3888 to W.L. 7724.
The Collimator and Telescope are rigidly fixed at right angles, thus the instrument will stand in a corner, is always ready for use and in adjustment.
The wave-lengths can be read off by the observer without moving from his place.
The object glasses and prism are large (1" clear aperture), which enables the faintest visible lines to be seen.
The eyepiece has a bright pointer for measuring the W. L. of bright lines on a dark field.
Means are supplied of very simply setting the Zero, although on account of the great rigidity and careful construction throughout it may be used for many months without any setting being needed.
ADAM HILGER, Ltd., 75a Camden Road, London, N.W.
AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.
ILLUSTRATED LIST ("A") OF SPECTROSCOPES AND SPECTROSCOPIC ACCESSORIES
ANY KIND OF SCIENTIFIC INSTRUMENT MADE TO ORDER.
Prompt Attention to all Orders and Inquiries. EXCEPTIONAL TERMS TO COLLEGES, INSTITUTIONS, &c. Quotations submitted for Laboratory Outfits or Single Instruments. THERMOMETERS FOR STUDENT WORK A SPECIALITY. Catalogues Post Free. (State which required.)
8, 9, & 10 HATTON GARDEN, LONDON.
MACMILLAN & CO.'S SCIENCE CLASS BOOKS.
ADAPTED TO THE SOUTH KENSINGTON SYLLABUSES.
I. PRACTICAL PLANE AND SOLID GEOMETRY.
Practical Plane and Solid Geometry for Advanced Students.
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Building Construction for Advanced Students. By J. W.
metic, Algebra, and Ge metry. By H. S. HALL, M.A., F. H STEVENS, M.A. 2s. 6d. Graduated Test Papers in Elementary Mathematics. By Rev. WALTER J. WOOD, M.A. Mathematical Tables for Ready Reference. FRANK CASTLE, M.I.M.E. Sewed. 2d. Practical Mathematics for Beginners. By F. CASTLE. 2s. 6d. Key, 5s. net.
VI. THEORETICAL MECHANICS.
Mechanics for Beginners. By W. GALLATLY, B.A. 2s. 6d.
Applied Mechanics for Beginners. By J. DUNCAN,
Lessons in Applied Mechanics. By Prof. J. H. COTTERILL,
VIII.-SOUND, LIGHT, AND HEAT, AND
Elementary Lessons in Heat, Light, and Sound. By D. E.
Lessons in Heat and Light. By D. E. JONES, B.Sc.
Elementary Physics. By BALFOUR STEWART, F.R.S.
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Chemical Arithmetic. By S. LUPTON, M.A. With 1200
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MARINE ORGANISMS, Hydrozoa, Crustacea, Annelida, &c., polyps extended, without pressure, dark ground or opaque, very beautiful." List. Exhibition Groups of Diatoms, Petrological, &c.
Dispersal of Mr. HORNELL'S collection of Slides, Marine and Botanical, from 3d. each.
SECOND-HAND, large and ever-changing stock. Van Heurck, new, others including Objectives, Condensers, Polariscopes, &c., by Watson, Ross, Powell and Lealand, Beck, Pillischer Reichert, Leitz, &c. Prismatic Binoculars, Lantern Slides, Mounting Materials. Lists.
Mr. HERBERT CLARKE, 104 LEADENHALL STREET, LONDON. Tel.-1316 Central.
ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES.
25 Specimens, 5/6; so do., 10/6; 1oo do., 21/-; 200 do., 42/20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy.
A large stock of Minerals, Rocks, Fossils and Microscopic Objects for
NEW CATALOGUE POST FREE.
THOMAS D. RUSSELL, 78 Newgate St., London, E.C
Gentlemen interested in the above study are invited to send to JAMES R. GREGORY & CO.,
1 Kelso Place, Kensington Court, London, W., for a Prospectus of
THE TWENTIETH CENTURY ATLAS OF MICROSCOPICAL PETROGRAPHY, now being issued in Twelve Monthly Parts, each Part containing Four Fine Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.
WATKINS & DONCASTER,
Naturalists and Manufacturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
SPECIAL SHOW-ROOM FOR CABINETS.
N. B. For Excellence and Superiority of Cabinets and Apparatus, refer ences are permitted to distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, birds' eggs AND SKINS, SPECIALITY.-Objects for Nature Study, Drawing Classes, &c.
Birds, Mammals, &c., Preserved and Mounted by First-class Workmen true to Nature. All Books and Publications on Natural History supplied. 36 STRAND, LONDON, W.C. (Five Doors from Charing Cross.)
New Catalogue (102 pp.) just issued, post free.
LANTERN SLIDES of Scientific Subjects,
from 6/- per dozen.
Also Hand Painted from 1/3 to 5/- each.
Slides from Prints, Drawings, Photographs, &c., a Speciality.
MARINE BIOLOGICAL ASSOCIATION
Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy-
SLIDES.-Orchids, Cacti, Palms, Insectivorous Plants, &c.-For lists apply L. FARMAR, 6 Mortlake Terrace, Kew.
PHOTOMICROGRAPHY for Publishers,
Lecturers, Manufacturers, and general scientific research. Good work, moderate charges.-SAXBY, 91 Penny Lane, Sefton Park, Liverpool.
NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial Communications to the Editor. The telegraphic address of NATURE is "PIUSIS," LONDON.
Represents K and L types, giving 3.5 H.P.
and 5 H.P respectively.
Immediate Delivery for Stock Sizes
Up to the end of 1904, over 51,000 gas and oil engines had been delivered, representing about threequarters of a million actual horse-power.
CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER
NEW MICROSCOPIC SLIDES
From the New Issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free on application.
Send for Special Descriptive List.
Section of Brazilian Quartz, showing cavities containing fluid.
Trypanosoma Brucei (Tsetse Fly disease)
25 0 40
Set of 5 Slides of the Garden Spider, showing different stages of
Blood-sucking Maggot (from the Congo)
Fly hatched from above, Auchmeromyia luteola
Eggs of Emperor Moth, fertile and sterile, on 1 slide
Leg of Flea, showing muscular structure
Set of 16 Slides illustrating the development of an Ascidian
SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS.
WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists.
W. WATSON & SONS, 313 High Holborn, London, W.C.
Branches-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM.
DALLMEYER'S TELE-PHOTO. LENSES & ATTACHMENTS
Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 6t Fifth Avenue, New York.-THURSDAY, August 31, 1,