An Important 
Book on 
OPTICS 
LIGHT WAVES 
and THEIR USES 
By A. A. MICHELSON 
HESE lectures, delivered at the 
Lowell Institute, proved so pone 
lar and interesting tha was 
determined to make them av ailable in 
book form. This volume will be found 
o _ practical value by all who 
have to solve engineering or mechani- 
= problems that call for extreme 
1 as the manufacture of 
tools, and mac chinery, 
Numerous practical applications of re- 
nt theories, together with accurate 
illustrations and de escriptions of appa- 
ratus add materially to the value of the 
ubject, presented in 
an original and entertaining manner 
and yet with no sacrifice of scientific 
accuracy. The subjects discussed are 
as follows: 
Wave Motion a d Interference —Comparison of ¢ 
Efficiency of the Microscope Telescope, and seer 
ferometer— Application of In nrg paar Methods to 
Measurements o Distances _and An ss 
tion of Interference M L 
Waves as pes th— Analysis of the 
the Inte 
rds ip pb 
etism a Ligh bodied b 
Eche . -_s of hace 
erometer mois the a Applica 
ference Methods to Astro a Ba 
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The 
Psychology of Child 
Development 
| ASTON I LS TIRE ET ESI, 
By IRVING KING 
PRATT INSTITUTE 
ery —— a paw a —_ —_ a 
oat ‘and i udied by rybody w ho has 
developing t 
rogresstve Teaches, 
This approach the subject of 
rudy toon ot ‘lee An mt not — on 
the seme ns that Id psycho! ae ey, fers dult 
reduced t 
psychology lowest term 
‘S a most vali ~ va addition to our " child peychology 
literature.""— }#¥s ail of Educ 
a book sound in theo cory, full of sugges- 
tion, and valuab sy alike to 4 pra ractical tea cher and the 
educationalist.”— The Education ws. 
280 pp., pa cloth, Bt. 00, wet; 
ostpaid, $1.1 
At all booksellers, or order direct from 
The University of Chicago Press, Chicago, LIl. 
1904 
a copy of Michelson’s Light Waves 
and Their Uses. I P inclose $2.12 in payment for same. 
Please send m 
The Velocity of Light 
(PREPRINT yg Fi 
RS HICAGO 
DECENNIA puahitatiane: 
lake 1x) 
y — ERT a ag ign heii 
Professor and Head of the Department 
of aseten in the Sarvanaty of Chicago 
_ SEU AL Pht RRO IRR 
ROF ESSOR MICHELSON’S acne 
Vv 
among physicists. Foll the line of his 
early ri ts he now describes a new 
method by whi 
h the velocity of light, the 
accurate determination of which is of such 
great importance in ee and astronomical 
research, ma dicigag ae enh very narrow 
margin of e ee ee 
f2 — iti sis $8 a. 
mel 25 Postpaid, 27 cents 
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