THE MICROSCOPE STAND 



101 



pattern No. 3213 except as regards the base and stage. The 

 former is folding, and has the same spread as that of the standard 

 model. The stage with the substage attached removes for 

 packing into the case. It is so made that when in position it 

 is even more rigid than the standard form. It is attached on a 

 bracket and is held in position by a taper bolt. The substage 

 has all the adjustments of the No. 3213, including focussing 

 rack and pinion, centring by screws and a swing-out motion. 

 The instrument is packed in a case which only measures 11^ X 

 8x2^ inches. It is as perfect an instrument in every way 



]FiG. 93.— No. 3221, Portable Standard London Microscope 



as |the ordinary model. The /case will carry two eyepieces, three 

 object glasses, substage condenser, dark-ground illuminator, 

 a detachable mechanical stage, triple nosepiece, and a bottle 

 of oil, together with a supply of slips, cover glasses, and sundry 

 small apparatus. It does not weigh much less than the 

 ordinary model. The small dimensions of its case render 

 it specially suitable for travelling where a bulky instrument is 

 inadmissible. It has no disadvantages due to its portability, 

 and most standard apparatus can be fitted to it. For the ordinary 

 microscopist who takes his instrument^from place to place it is 

 very convenient. 



