A WEEKLY LEE USTRALE Ds |OURNAE OR SCIENCE: 
“To the solid ground 
Of Nature trusts the mind which builds for aye. 
”._WORDSWORTH. 
~ No. 2210, VOL. 89] THURSDAY, 
M ARC H 7, 
‘1912 [Price Sr SIXPENCE > 
__Rexistered | asa Newspaper : at the General Post Office. ) 
WRIGHT & NEWTON’ Ss 
PROJECTION MICROSCOPE. 
Improved Pattern with Centering Substage, &c. 
Maenifications up to 5000 or 6000 diameters easily 
obtainable. 
Write for Fully Illustrated Catalogue to 
NEWTON & CO., 
Manufacturers of Optical and Scientific Instruments, 
3 FLEET STREET, LONDON, E.C. 
MICROSCOPE. 
A New Form for Research Work. 
(THE REGENT MODEL.) 
Slow motion four times 
finer than usual. 
Swing-out centring and 
focussing substage. 
lris diaphragm in stage 
level with surface. 
Finder divisions to 
mechanical stage, &c. 
CANTOR LECTURES 
By Conrap Beck 
on the Theory of the 
Microscope, Price I/- 
R. & J. BECK, LTD., 
68 CORNHILL, E.C. 
THE “LONDON” | 
ly All Rights Reserved. 
TANGENT | 
GALVANOMETER 
(9389). On one side of the circle three separate windings of 
to turns each of No. 24 D.S.C. copper wire, the diameter of each 
is 4# in., 7? in., and 10} in. 
respectively ; on the osher 
side of the circle three wind- 
ings of the same diameter, 
but with twice the number of 
turns of wire, viz., 20 turns 
each. Each of the winding 
ends has a pair of terminals 
fixed on the circle. A small 
ebonite tablet fixed under 
each pair of terminals 
states the particulars of the 
windings connected to those 
terminals. Agate centre to 
magnetic needle in brass case, polished teak base, £4 oo 
(EXTRACT FROM NEW PHYSICAL LIST.) 
_ BAIRD & TATLOCK (London), LTD., 
14 Cross Street, Hatton Garden, London, E.C. 
NEGRETTI & fee 
Standard...) ee 
Awarded 
2 Grands Prix 
Meteorological Turin 
INTERNATIONAL. 
Instruments. EXHIBITION, 
tgtt, for 
Scientific 
Instruments. 
Full particulars post free on application to 
88 HOLBORN VIADUCT, LONDON, E.C. 
Branches: 45 CORNHILL, E.C.; and 122 REGENT ST., W. 
