Ixxxiv NATURE [OcTOBER 23, 1913 
MIDGET FURNACE 
FOR USE WITH BUNSEN BURNER. 
PRECISION METERS 
FOR ACCURATE MEASUREMENT OF 
GAS or AIR. 
The inside lining of this furnace is 
hardened by a special process to with- 
stand great heat. , 
With 57,” burner, complete 4/G 
READING BY THE POINTER 
from 1 c.c. upwards. 
MADE IN 40 RANGES. 
Catalogue M.N. on application to:— " 3" y ” 6/6 
SOLE MAKERS, — 
ALEXANDER WRIGHT & CO., Ltd., | | MeMUUNESte2\me: MERCER. 
: LTD. 
og cl ee ee 34 Camomile Street, London, E.C. © 
THE “TECHNICAL” SERIES OF PHYSICAL APPARATUS. 
LIST No. 56 (54 pages). 
COVERING APPARATUS FOR 
EXPERIMENTS 
IN HEAT, 
SENT POST FREE TO TEACHERS ON REQUEST. 
q Every piece of apparatus in this Series has been 
designed to combine 
Durability, Aceuraey, and Moderate Price, 
and that such has been achieved is proved by the large ; 
demand for the apparatus by those engaged in teaching 
Physics on the most approved. modern lines, 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “ HARRIS” 
SPECTROMETER. 
See editorial notice in WA TURE, August 25, 1910, page 248, ; 
SCHOOL WORLD says :—‘' Messrs. Gallenkamp are favourably 
known to teachers of science.as laboratory and assay outfitters. Their 
lists always contain particulars of many interesting instruments and 
devices, and the present catalogue is no exception to this rule. In 
addition to the usual instruments, the catalogue gives particulars and 
prices of new apparatus described in The School World and other 
periodicals, and in various works on heat. Even the most original 
teacher has to make use of instrument-makers’ apparatus to some | 
extent, for there are pieces of apparatus which must be purchased if 
convincing and accurate experimental results are desired in the lecture- 
room and the advanced physics laboratory. With Messrs. Gallenkamp's | 
catalogue before them, the selection of good instruments at a moderate 
cost, for work in heat, is facilitated.” 
A. GALLENKAMP & CO., Ltd., 
19 & 21 SUN STREET, Finsbury Square, LONDON E.C. 
A cheap and reliable Instrument specially designed for 
Students’ use. 
Very strongly constructed so that it may be used by 
elementary pupils without being put out of order, 
PRICE £2:10:0 Each Net. 
Descriptive Pamphlet on application. 
PHILIP HARRIS & 60., tro. 
BIRMINGHAM 
(ENGLAND.) 
Printed by Ricnarp CLAY & ‘Sons, Limrrep, at Brunswick Street, Stamford Street, S.E., and published by MAcMILLAN AND Co,, LimiTED, at 
St. Martin's Street, London, W.C., and THE Macmittan Co., 66 Fifth Avenue, New York.—TxHurspay, October 23, 1913. 
