La locomotiva . e del tedesco Physikalisch-Technische Reichsanstalt. estendentesi dal 82 ° C. A ioo° C. (180° a 2120 Fahr. 1.e descritto in pelliccia Zcitschrift Instrumcntcnkundc. Vol. 13 settembre. CAT pari a.;.pagina 329. e (2) una serie bv M. Thiesen e K. Scheel, estendentesi da- ri° C.a +250 C. (120 a 77° Fahr.). e descritto nella stessa ufficiale per il mese di giugno.toot. Vol. 2T. pagina 17s, e più pienamente nel Wissenschaftliche Abhandlungenof Reichsanstalt l. Vol. 3. tqoo. piee j. Abbiamo capito che le osservazioni,consegnato per essere di un simibr rH"r di precisione, animano hanno fatto da Chappuis; 1907-]

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The Locomotive . e, of the German Physikalisch-Technische Reichsanstalt. extending from 82 ° C. to ioo° C. (180° to 2120 Fahr. 1.and described in the Zcitschrift fur Instrumcntcnkundc. Vol. 13, September. tRq.;.page 329. and (2) a series bv M. Thiesen and K. Scheel, extending from— ri° C.to +250 C. (120 to 77° Fahr.). and described in the same journal for June.toot. Vol. 2T. page 17s, and more fully in the Wissenschaftliche Abhandlungenof the Reichsanstalt. Vol. 3. tqoo. piee j. We understand that observations, handed to be of a simibr rH»r of accuracy, have liven made by Chappuis; 1907-] THE LOCOMOTIVE. 247 but these have apparently not been published, and Wiebe, in the preface to hissteam tables (Taieln iiber die Spannkraft des Wasserdampfes, Braunschweig, 1903), states that Chappuis has informed him in a personal letter that theycannot yet be regarded as final, because they are probably affected by systematic errors. We shall first take up Wiebe1 :xpe erimentSi in the execution of which he R. Fig. 1.— Wiebes Apparatus. was assisted by Fr. Grutzmacher. Wiebe does not describe the apparatus thathe employed, but we understand that it was substantially identical with thatdescribed by W. Pomplun in the Zeitschrift fiir Instrumentenkunde for January, 1891, Vol. 11, page 1, which had been constructed for the Reichsanstalt a shorttime previously, and with which Pomplun had already made some preliminaryexperiments. Wiebe may have made some minor changes in it, but as we find 248 THE LOCOMOTIVE. [October, no statement to this effect, the apparatus will be described in the form in whichPomplun used it. It consisted essentially of two parts, (i) the steam-generating device, shownat K in Fig. i, and (2) an air-reservoir, shown at F in the same illustration.The principle involved is identically the same as that underlying the apparatusof Regnault that is illustrated on page 92 of The Locomotive for July, 1906, and fully described in the same issue. The fundamental idea