204 PROCEEDINGS OF THE SOCIETY. 



REPORT OF THE MICROSCOPE COMMITTEE. 



First published in the " Journal of the British Science Guild " for 



November, 1916. 



Members : — Dr. R. M. AValmsley (Chairmau), C. 0. Bannister, Esq.^ 

 J. E. Barnard, Esq., Dr. E. H. Barton, F.R.S,, Sir George 

 Beilby, F.R.S., Professor F. J. Cheshire, C.B.E., Professor Cnllis, 

 Dr. C. Desch, Dr. J. W. Evans, J. W. Gordon, Esq., K.C., Pro- 

 fessor A. Harker, F.R.S., Dr. Hutchinson, Sir Herbert Jackson^ 

 K.B.E., Professor Martin Dowry, F.R.S., Robert Mond, Esq., 

 Dr. Rosenhain, F.R.S., Dr. J. E. Stead, F.R.S., Sir J. J. H. 

 Teall, F.R.S., H. H. Thomas, Esq., and the Officers of the Guild. 



The Committee has the honour to present tlie result of its labours 

 in the form of three draft specifications for the following types of 

 microscopes : — 



I. Petrological Microscopes for teaching purposes. 

 II. Chemical Microscopes : — 



(a) Simple form, for use in laboratories. 



(b) Suggestions re chemical microscopes for ad- 



vanced work. 

 III. Metallurgical Microscopes. 



These specifications embody the labours of the Committee at ten 

 meetings, and in presenting them the Chairman reports that the proce- 

 dure adopted by the Committee was to draft, in the first instance, 

 provisional specifications and to circulate them to prominent firms, with 

 an invitation to attend a conference at which they would be considered 

 in detail. The invitations were cordially acknowledged, and the Chair- 

 man desires to record the obligations which the Guild is under, not only 

 to the members of the Committee set forth above who have assisted at 

 its deliberations, but also to members of the trade who have attended 

 meetings at which the final drafts of the various specifications were 

 settled. The thanks of the Guild are especially due to Mr, Mansell P. 

 Swift (Messrs. James Swift and Son), and to Mr. F. W. Watson Baker 

 (Messrs. W. Watson and Sons, Ltd.). 



Unfortunately, owing to the urgent demands of war business, other 

 manufacturers who in ordinary times would willingly have assisted the 

 Committee, were unable to send representatives to attend its meetings. 

 It is believed, however, that the agreed specifications reported are such 

 as will meet with the general approval of the manufacturers. 



Specifications. 



I. Draft Specifications of Students' Petrological Microscopes for teach- 

 ing purposes. The price of the Petrological Microscope, for which the 

 following general specification is suggested, should not exceed £15, with 

 such fittings and accessories as are specified in paragraphs 1 to 9. 



