32 



V. — The " Disk-cutter," a New Instrument for cutting circular Disks 

 of thin Glass for Mounting Microscopical Objects. Also the 

 description of a Collecting Stick for procuring Infusoria, dtc. 

 By George Shadbolt, Jun., Esq. 



(Read October 25th, 1848.) 



As the principal object of the meetings of this Society is the inter- 

 change of ideas among the members, on all matters connected with 

 microscopical science, I shall make no apology for describing the 

 subjects of the present paper, considering, that they may be of in- 

 terest to some, and that it is preferable to occupy attention for a 

 short time, for that which may prove of little value, rather than by 

 abstaining from doing so, running the chance of leaving uncommuni- 

 cated what may possibly prove of use. 



Few people who have made 

 much use of a microscope, can 

 have failed to appreciate the use 

 of circular disks of thin glass for 

 mounting some objects (particu- 

 larly such as require to be in 

 cells) and for other purposes, 

 such as repairing a broken live- 

 box, &c. Having myself con- 

 stantly found occasion for glass 

 disks, and as frequently as not 

 found that what I had by me 

 were not of a suitable size, I 

 made use of various schemes for 

 cutting them, and after reject- 

 ing several, contrived the instru- 

 ment figured in the annexed 

 drawing, which I find answers 

 the purpose completely. 



A steel rod, a a, runs through 

 a brass tube, b, having at one 

 end an ivory head or handle, c, 

 and at the other a cylinder of 

 wood, d, about the same dia- 

 The tube has attached to its lower extremity, 



meter as the tube b. 



