APPENDIX. 357 



table showing the corrections to be applied to each 

 ruled space to reduce it to the United States standard.) 



Standard half metres and standard metres, either on 



glass, steel, iron or nickel surface, from $25.00 to 100 00 



Test plates, micrometers, etc., are also ruled by Mr. Charles 

 Fasoldt, 594 Broadway, Troy, N.Y. The author has one of Mr 

 Easoldt's 120,000 band plates, which he values very highly. He 

 regrets not being able to give Mr. Fasoldt's Catalog ;ie of Prices. 



