Emcli — Emde. 



335 



Ultrarot & einige Anwendgn. hochempfindl. K- 

 Zellen*), 3 S. (12, 11). — D. photoelektr. Ef- 

 fekt am K bei sehr gering. Lichtstärken*), 8 S. 



— Lichtelektr. Photometer für sichtbares 

 Licht*), 5 S. — Messgn. d. Intens, d. Sonnen- 

 lichtes während d. Finsternis v. 17. Aprü*), 

 3 S. (13, 12). — Proportional, v. Lichtstärke & 

 Photostrom an Alkalimetallzellen*), 11 S. — 

 Influenztheorie d. Niederschlagselektriz.*), 6 S. 

 (14, 13). — Verwendg. lichtelektr. Cd- & Zn- 

 Zellen z. Photometr. d. ultraviol. Sonnen- 

 lichtes*), 7 S. — Notwend. Vorsichtsmaßregel 

 bei d. Photom. sehr großer Lichtstärken mittels 

 hochempfindl. Alkalimetallzellen*), 2 S. (15, 14). 



— Verbessergn, am Cd-Photometer für ultra- 

 viol. Licht*), 3 S. (16, 15). — Stromschwankgn. 

 in Vakuumröhren bei Gegen-w. v. Alkalimetallen, 

 ihre Bedeutg. für d. Entladg. -Vorgang & für 

 d. Messg. äußerst kleiner Lichtintens.*), 9 S. 

 (17, 16). — Scheinbare photoelektr. Nach- 

 wirkg. am K & Einfl. d. Entgasg. axif d. Photo- 

 effekt an Metallen*), 7 S. (21, 20). 



Terrestr. Magnetism & Atniosph. Electr.: D. 

 Radioakt. d. Erdsubst. als e. d. Ursachen d. 

 lonengehaltes d. Atmosph.*), 12 S. (9, 1904). 



— Luft- & photoelektr. Beobachtgn. währ. d. 

 tot. Sonnenf. v. 30. Aug. 1905 auf Mallorca*), 

 44 S. (11, 16). 



Verh. d. Ges. Deut. Naturf. u. Ärzte: Gegen- 

 wärt. Stand d. Radiumforschg., 19 S. (81, 1909). 



Zeltsohr. f. Instrum. -Kunde: Einrichtg. & 

 Behandig. d. Apparate z. Bestimmg. d. Radio- 

 aktivität V. Bodenproben & Quellsedimenten*), 

 9 S. (24, 1904). 



•) m. H. Geitel. 



IV Emch, Arnold. Dr. phil. 1895 

 Lawrence: 1900—06 Prof., Math., Univ., 

 Boulder, Colorado, 06—10 Prof., Kan- 

 tonschule, Solothurn, 10 — 11 Prof., Obere 

 Realsch., Basel, seit 11 Assoc. Prof., 

 Math., Univ., Urbana, 111. (Eig. Mitt.) 

 Introd. to projective geometrv & its applicats., 

 267 S., New York 1905. — Kinemat. Gelenk- 

 systeme & d. durch sie erzeugt, geometr. Trans- 

 format., 66 S., Solothurn 07. 



Amer. Journ. of Math.: Propert. of closed 

 convex curves in a plane, 6 S. (35, 1913). — 

 The medians of a closed convex polygon, 10 S. 

 {37, 15). ■ — Some properties of the medians 

 of closed contin. curves formed by analytic 

 arcs, 13 S. (38, 16). — Proof of Pohlke's theo- 

 rem & its generalizats. by affinity, 9 S. (40, 18). 



— A cert. class of rational ruled surf., 22 S. 

 (42, 20). — Incidences of straight lines & plane 

 algebr. curves & surfaces generat. by them 

 (44, 22). — 



AnuT. Math. Monthlj : Some mechanical de- 

 vices to generate cert. syst, of curves (19, 

 1912). — Some geom. propert. of circul. trans- 

 format. (21, 14). — The cLrcle theorem (23, 16). 



— A useful principle of curve tracing. - — A 

 problem of perspective (24, 17). — Cellular 

 subdivis. of space (25, 18). — An elementary 

 problem of closure on the equilateral hyperbola 

 (26, 19). — Construct. & modelling of algebr. 

 surf. (28, 21). 



Anier. Math. Soc. Bull.: The p-discriminant 

 of ordinary linear different. equats., 3 S. (10, 

 1904). — Closed contin. curves, 3 S. — Two 

 convergency proof s, 7 S. (20, 14). — A cert. 

 class of funets. connect. with Fuchsian groups, 

 5 S. (22, 15/16). — A theorem on the curves 

 described by a spheric. pendulum, 3 S. (23, 

 16/17). — The invariant net of cubics in the 



Steinerian transformat., 4 S. (24, 17/18). — 

 Plane algebr. curves with a given syst, of foci, 

 5 S. — A cert. generat. of rational circular & 

 Isotropie curves, 8 S. (25, 18/19). — Kinematics 

 in a complex plane & some geometr. applicat. 

 (28, 22). 



Ann. of Math. Harvard Coli.: The rectilinear 

 congruence realizing a circular transformat. of 

 one plane into another, 6 S. (13, 1911/12). — 

 Involutoric circular transformats. as a partic. 

 case of the Steinerian transformat. & their in- 

 variant nets of cubics, 15 S. (14, 12/13). — 

 Geom. properts. of the Jacobians of a cert. 

 syst, of funets, 9 S. (15, 13/14). — Some general 

 theorems concern. ordinary closed cuirves, 4 S. 

 (16, 14/15). — Applicat. of a group of order 16 

 to a configurat. on an elliptic cubic (18, 16). 



Archiv d. Math. & Physik: The different. 

 equat. of curves of normal stresses in a plane, 

 7 S. (18, 1911). 



Atti. IV. Congr. Intern, dei math., Roma: D. 

 Rechenkünstler Winkler & seine Methoden 

 (3, 1909). 



Colorado, Univ. Studies: Some special algebr. 

 transformats. realized by linkages, 9 S. (1, 1903), 



— Notes on the p-d&criminant of ordinary 

 Linear diff. equats., 6 S. — Newton's 5 types of 

 plane cubics obtain. by the Steinerian trans- 

 format., 10 S. (1, 04). — Theory of Compound 

 curves in field engineering, 17 S. (2, 04). — A 

 few examples in the theory of funets., 17 S. 

 (2, 05). 



Kansas, Acad. Trans.: Cert. methods of the 

 geom. of posit,, 11 S. (18, 1901/02). 



L'Enseignement Math^matlque: Qqs. exem- 

 ples dans 1. sciences naturelles (12, 1910). 



Mltt. d. naturforsch. Gesellsch. Solothurn: 

 Math, in Natur & Kunst (15, 1906). — Gesetze 

 d. Zufalles (16, 11). 



Palermo. Clrc. niateni. Rend.: Configurats. 

 of the points of inflex. of a cubic & their har- 

 monic polars, 4 S. (23, 1907). — Conformal 

 rational transformats. in a plane, 12 S. (34, 12). 

 -Properts. of closed contin. curves, 5 S. (38, 14). 



Revlsta Math. Hisp. Anieric: Sobra la ecua- 

 zion polar de las curvas algebricas (4, 1922). 



Tohoku. Math. Journ.: The fundament. 

 theorem of projective geom., 14 S. (10, 1916). 



— Closed curves described by a spheric. pen- 

 dulum, 20 S. (15, 19). — The projective descript. 

 of cyclides, 7 S. (19, 21). — Plane algebr. curves 

 which are invar. under a quadratic Cremona 

 transformat., 17 S. (21, 22). 



Emde, Fritz, Dr. phil.; o. Prof., 

 Elektrotechn., Techn. Hochsch., Stutt- 

 gart. 



Archiv d. Math. u. Physik: D. Charakter d. 

 Betribeskurven eines Gleichstrommotors mit 

 Nebenschlußerregg., 23 S. (5, 1903). — Zur 

 Vektorenrechng., 11 S. — Z. Berechng. d. 

 reellen Nullstellen d. Besselschen Zvlinder- 

 funkt., 12 S. (24, 16). — Schwinggn. & Vek- 

 toren, 8 S. (25, 17). — 



Physik. Zeltschr.: D. elektr. Feld d. Trans- 

 formators, 3 S. (23, 1922). 



Emde, Hermann, Dr. phil. 1906 Mar- 

 burg; stud. 00—06 Marburg & Braun- 

 schweig, 11— 12 Straßburg; 06— 12 Assist., 

 08—20 Privatdoz., Techn. Hochschule, 

 Braunschweig; * 1880, Dez. 10, Opladen, 

 Rheinl. (Eig. Mitt.) 



Hrsg. m. H. Beckurt: Jahresbericht d. Phar- 

 mazie, Göttingen 1906 — 11. — In Dammer, 



