36 L. CASELLA'S CATALOGUE 



THE PEDOMETER. 



The pedometer consists of a simple arrangement of weight and pendulum acting 

 on plain toothed wheels, by which the distance walked by the wearer is accurately 

 measured. In size and form it resembles a small watch, the annexed plate being rather 

 over the real size. The figures and divisions represent one to twelve miles, divided into 

 halves and quarters. To the invalid lady or gentleman requiring limited walking 

 exercise, as well as to the hearty active pedestrian, it is equally valuable and 

 trustworthy. It may be worn suspended from the neck, or placed in a front or 

 waistcoat pocket, being kept upright by means of the small hook (a). The pedometer is 

 adjusted with perfect ease to the step of the wearer, however long or short, and altered 

 at pleasure to any step required. 



124. Pedometer, in silver case with strong crystal glass (Fig. 124, p. 35) 2 15 



125. Pedometer, in German silver case . . . . . 250 



IMPROVED CHRONOGRAPH, 



For the correct registration of any number of rapidly passing objects, as at regattas 

 and races, as well as eclipses and occultation of stars, the exact speed of machinery, etc., 

 by merely touching a spring without removing the eye from the objects. In size and 

 form the chronograph precisely resembles a watch ; it is made of silver, and consists of 

 an ordinary quick train lever movement, with the addition of a centre seconds-hand, 

 which traverses the dial as in a stop seconds watch. By this means time is taken to 

 the tenth of a second, in either scientific or sporting pursuits, without the confusion and 

 anxiety of taking the eye from the object. 



126. Chronograph, as above ... . . .990 



CLINICAL THERMOMETERS. 



CASELLA'S Clinical Thermometers, as expressly arranged by Dr. Aitkin of the 

 Eoyal Hospital, Ketley, for use at that great military establishment. In Aitkin' s 

 arrangement two thermometers are used, the one bent for reading in situ, the 

 other straight for reading by registration where the danger of fever, defective 

 sight, and other causes might render direct observation difficult, or even 

 dangerous. Of the many uses to which CASELLA'S Maximum Thermometers 

 are now applied, perhaps none are equal in importance to their application for 

 clinical purposes, and though many desultory efforts were made at various 

 times, none certainly assumed the distinct form of applying this principle until 

 taken up by Dr. Aitkin. SeeAitkin's "Science and Practice of Medicine," 1st, 

 2nd, and 3rd Editions which show that his description of clinical tempe- 

 rature by registration, considerably precedes all other names associated 

 with it. This thermometer registers the greatest heat of the body in 

 ' any position. It may be inserted in the mouth, the axilla, or between the 

 thighs, so as to be well covered, and in two and a half to three minutes re- 

 moved to the light and read off at leisure. Length 9 inches, divided and 

 figured on the stem from 80 to 115 or 120 in 5ths of degrees. 



127. The two in neat pocket case, as above . . . . 150 



