290 'Scientific Proceedings^ Royal Dublin Society. 



some of them amounting to several minutes. JSir Howard Grubb was the 

 principal worker in tlie reform which the Society instituted. On tlie introduc- 

 tion of the telephone, with its innuraerahle overhead wires, which were 

 constantly breaking and short-circuiting the clock-wires, the system was 

 restricted to Leinster House, Trinity College, and the Port and Docks Board^ 

 where it is still in operation. 



In the year 1900 Sir Howard Grubb patented an entirely new form of 

 gun-sight, and he subsequently devised the improved form of periscope — 

 the instrument used for seeing above water from the hull of a submerged 

 sub-marine. This instrument is now used in the Royal Navy. 



Among other instruments which he has improved or invented may be 

 mentioned the micrometer, stereoscope, heliostat, depleidoscope, circum- 

 ferentor, and various geodetic instruments. 



It is not alone in his own particular line that Sir Howard Grubb lias 

 done work which has made his name known in every country in the civilized 

 world, and shed lustre upon his country. He has for an unusually long 

 period taken an active part in the entire work of the Royal Dublin Society — 

 which alone merits the Society's highest approbation. 



We append a list of Sir Howard Grubb's chief contributions to the 

 scientific publications of the Royal Dublin Society and other bodies. 



List of Publications. 



1. On a Recently Observed Meteor. Journal Eoyal Dublin Society. 1869. 



2. On the Great Melbourne Telescope. Journal Eoyal Dublin Society. 1869. 



3. On Clocks for Equatorial Telescopes. Journal Royal Dublin Society. 1873. 



4. On the Testing of Large Objectives. British Association Report. 1876. 



5. On a Method of Photographing the Defects in Optical Glass arising from 

 want of Homogeneity. British Association Report, 1876. 



6. On Babbage's System of Mechanical Notation as applied to Automatic 

 Machinery. Scient. Proc. Royal Dublin Society. 1877. 



7. On Great Telescopes of the Future. Scient. Trans. Royal Dublin Society. 

 1877. 



8. On a New Form of Electrical Contact-maker for Astronomical and other 

 Clocks. Scient. Proc. Eoyal Dublin Society. 1878. 



9. Improvements in the Stereoscope. Scient. Proc. Royal Dubhn Society. 

 1879. 



10. On the Equatorial Telescope, and on the New Observatory of the Queen's 

 College, Cork. Scient. Proc. Royal Dublin Society. 1879. 



