1892.] 



MICROSCOPICAL JOURNAL. 



165 



evening, Tuesday, and Wednesday morning of a week occupied 

 by the A. A. A. S., and see if you do not succeed better. You 

 liave already begun to do wisely in accepting the city selected by 

 the A. A. A. S. for your place of meeting. We are not oblivi- 

 ous to the disadvantages of such a course, but the fact is that you 

 are not strong enough yet to cut loose and to try to stand alone. 



MICROSCOPICAL APPARATUS. 



The Lane-Sear Microscope Lamp. — Stability. —No lamp 

 that is easily upset is a desirable companion to the microscopist. 

 In the " Lane-Sear" lamp stability is insured by having the oil 

 vessel arranged around a central stem which rises from a thin but 

 heavy base and which is instantaneously secured at any required 

 height by the long radial screw shown in the illustration. This 

 mode of setting the burner at any required height is very good. 



Power. — This is obtained in its maximum degree by the em- 

 ployment of the Argand burner and b}- having a large condenser 

 on a double-jointed arm mounted with a ball-and-socket joint. 



Position. — It is often desirable, especially when working with 

 the higher powers, to get the flame as close as possible to the re- 

 flector. Every practical microscopist 

 sometimes tries to do this. It is here 

 accomplished by getting the burner on 

 the very edge of the oil-tank and within 

 a very few inches of the tal)le. No 

 other lamp of equal power will permit 

 of this, and with any ordinary table 

 lamp such a position is wholly out of 

 the question. 



Safety. — Safety in replenishing is 

 secured by having the cistern tubulated 

 at the opposite edge from the burner. 



Convenience. — By removal of the 

 bee-hive porcelain shade, which rests 

 on a gallery surrounding the chimney, 

 and which is commended though not 

 essential in using the lamp for micro- 

 scopical observation, and by adjustment 

 of the reading shade the lamp becomes 

 at once an ordinary table reading-lamp 

 of great power and efficiency. 



Accessories. — (a) On a ringed arm. 

 adjusted by a set-screw, and which can 

 be swung around the central stem so as 

 to graduate and sometimes localize the 

 heat, a porcelain water-bath may be 

 used. A smaller basin is sunk therein, 

 and it has a light cover of the same ma- 



