^ / 7" 



BECK'S 



NEW 



"BRITISH 



STUDENTS 



MICROSCOPES 



IN 



FOUR MODELS. 



ABSOLUTELY RIGID IN 

 EVERY POSITION. 



" s. d. 



EYEPIECES . . each 5 o 



Double Nosepieces . » 9 o 

 If supplied with Instrument. 



pRflMKLIN |M5TITUTE LlBRflRT 



FHIL/IDELFHm 



No. 64.-STANI 



Class 



71A 



Book 6./P.4- 

 7 



Accession 



D AND MAHOGANY CASE, 

 { 12s. 6d. 



No. 54) are provided with 

 Spiral Rack and Pihion 

 Coarse Adjustments, and 

 Fine Adjustments actuated 

 by micrometer screws and 

 large milled heads. Draw- 

 Tubes are engraved in tlie 

 Mm. Scale, and at once 

 record the exact amount of 

 mechanical tube-length in 

 use. The large square Stages 

 have a distance of 2\ inches 

 from centre of stage to limb. 

 The Under-Stages are of 

 full size and furnished with 

 an improved form of Iris 

 Diaphragm. Each Instru- 

 ment has Concave and Plane 

 Mirrors. Spread of Feet 

 7 inches. 



FULL CATALOGUES 



of our various Microscopes 

 and Apparatus will be 

 posted free on application, 

 as it is impossible to 

 include descriptions of 

 our ottier THIRTY 

 MODELS in a one-page 

 advertisement. 



No. 56.— STAND AND MAHOGANY CASE, 

 £4 7s. 6d. 



-STAND AND MAHOGANY CASE, 

 £5 12s. 6d. 



R. & J. BECK, Ltd., 68 CORNHILU LONDON, EC. 



