214 THE HISTORY AND DEVELOPMENT OF THE MICROSCOPE 



We note one admirable feature of the mechanical finish of the 

 microscopes of this firm, which is, that they avoid sharp angles and 

 knifelike edges to all their instruments. This looks a trine, but the 

 use of the microscope with saprophytic, pathogenic, or other infective 

 material requires the utmost caution that the skin of the hands 

 should be unbroken, and there can be but little doubt that all 

 unconsciously the edges and corners of microscopes finished to the 

 just pride of the mechanic do often break the skin, and are wisely 





m 



FIG. 171. Bausch and Lomb's sub-stage, 



to show construction. 



and happily worked into rounded edges in the instruments of these 

 distinguished makers, and, we may add, without the slightest loss 

 of that appearance of high finish which has always been correlative 

 with the manufacture of microscopes. 



If we now look at the No. 1 stand of the Spencer Lens Company, 

 of Buffalo, N.Y., we shall find again that the model of Oberhauser 

 is adhered to and the instrument is of the third class. This 

 microscope is illustrated in fig. 172. It is beautifully made, and 

 the horseshoe base has a still longer ' claw ' than those of Bausch, 



