24 



THE GUIDE TO NATURE 



New Observatory in Rochester. 



A complete observatory equipped 

 with instruments and accessories that 

 represent the latest stage in astronomi- 

 cal engineering has been erected by the 

 Bausch & Lomb Optical Company in 

 Huntington park, near the residence of 

 George N. Saegmuller, vice-president 

 of the company. Mr. Saegmuller first 

 planned it as a private observatory, but 

 the needs of the company, which has 

 gone into the construction of astro- 



While the observatory will be in 

 charge of Mr. Saegmuller and his three 

 sons, all of whom have taken univer- 

 sity courses in astronomy, the instru- 

 ments will be used by other scientists 

 of the Bausch & Lomb Company and 

 by others in the community who take 

 an interest in astronomy. It is intend- 

 ed to set apart an evening for the pub- 

 lic, giving it an opportunity to view 

 heavenly bodies that are of interest at 

 particular times. 



THE BAUSCH & LOMB OPTICAL COMl'ANY'S UBSERVATORY. 



nomical instruments, particularly tele- 

 scopes, made an observatory necessary 

 and it was decided that one should be 

 built by the company. 



The observatory will be used not 

 only for astronomical work, but for 

 testing the instruments of precision 

 that are made by the company and 

 which, because of the ever-increasing 

 demand for accuracy, demand most 

 thorough tests. Tests can be made in 

 the factory only with difficulty because 

 of the vibrations caused by machinery, 

 but will be made with great accuracy 

 in the observatory, since it will be en- 

 tirelv free from vibration. 



Construction of Observatory. 



The observatory consists of a tower for 

 large telescopes, thirty-three feet from 

 its main floor to the highest point in 

 the dome, and of an adjoining rectan- 

 gular wing for time and latitude instru- 

 ments. The main part of the tower is 

 hollow tile faced with concrete and the 

 dome, twenty-two feet in diameter, 

 consists of an iron frame covered with 

 wood and overlaid with sheet copper. 

 A layer of tar paper and felt is placed 

 between the copper and the wood to 

 protect the interior from sudden 

 changes in temperature. 



The wing for time and latitude in- 



