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NEGEETTI AND ZAMBRA, HOLBORN VIADUCT, E.G., 



NEGRETTI & ZAMBRA'S 

 IMPROVED PATENT CLINICAL THERMOMETERS. 



FIG. l. 



FIG. 2. 



308 THE importance of ascertaining and watching carefully the variations of tem- 

 perature in disease is now daily becoming more apparent. Hitherto one of the great 

 drawbacks to the general use of Thermometers by Medical Men has been the fact 

 that sufficiently portable and reliable instruments have not been obtainable, the 

 bubble of air used in Aitken's Thermometer being frequently found to be shaken 

 out, and the instrument disabled, when its use has been most urgently needed. 

 This difficulty is now overcome in the Clinical Thermometers invented and 

 manufactured by Messrs. Fegretti & Zambra ; they are, in fact, a portable form 

 of NEGRETTI AND ZAMBRA'S PATENT STANDARD MAXIMUM THERMOMETERS, 

 universally adopted in all parts of the world. The important advantage of this 

 Clinical Thermometer is the Indestructible Index nothing except breakage dis- 

 turbing the reliabilty and accuracy of its indications for the Column of Mercury 

 itself forms the index (without any intervening air-bubble or needle) simply 

 shaking down the mercury below the divisions on the tube after use at once adjusts 

 the Thermometer ready for future observation. Thus the Practitioner may now 

 with the greatest confidence and convenience carry about with him a valuable aid 

 in Physical Diagnosis, without any fear whatever of his Thermometer failing at a 

 critical moment, all other Clinical Thermometers being subject to the defect of 

 having their Indices shaken down into the bulb by concussion in carrying about, 

 and thus rendered useless. 



DIRECTIONS FOR USING NEGRETTI & ZAMBRA'S PATENT CLINICAL THERMOMETERS. 

 Holding the instrument firmly, with a rapid swing of the hand and arm shake or jerk down 

 the column of mercury until it sinks below the line of divisions on the stem of the Ther- 

 mometer, as shown in Fig. 1, at 90. The instrument is now ready for use, and being 

 applied to the body of the patient for a sufficient time, will indicate the maximum tempe- 

 rature by the position of the top of mercury in the tube, as seen in Fig. 2. It is not 

 requisite that this Thermometer be read off whilst in contact with the body of the patient, 

 for it may be removed and laid aside until a convenient opportunity occurs for noting its 

 indication. These Thermometers are divided to Fahrenheit's scale, each degree being 

 subdivided into fifths, or by the Centigrade scale, sub-divided into tenths. 



