Would You Be Interested? 



If a man came to your desk and 

 showed you a pen or pencil that 

 would add ov subtract Ji it wrno? 



Of course you would; anybody would I 



We have no nich pen or pencil, but we hive somethiiig better. Wo 

 Iia»e a typewntet which doej all thia, and you know that the typewriter 

 IS three tunes as fan ■> any pen or pendl. This typewriter i< die 



Remington 



- Adding-and Subtracting 



Typewriter 



(Wahl Adding IVIechanism) 



This machine adds oi subtract, and writes; not only diat but it 

 adds or subtracts who, It «.«(«.. Both operations are one. 



y«i m4lU, mocfcne M («,, ui,*, every man needs it who has 

 billing to do, or any writing and adding to do on the same page. It 

 saves time, saves labor, detects errois, ptevencs eirois, gives you a 

 mechanical insurance of absolute accuracy. 



We stand ready to give this machine a test «i gam Kvki a teat 

 which will convince you that you need ic 



Remington Typewriter Company 



{Incorporated) 



Wew York and Everywhere 



iPMl 



lEsterbrooK 



■ Radio Pens 



26 Styles 



The newest idea in 

 pens — the Esterbrook 

 line de luxe. Triple 

 silver plated — non- 

 corrosive and imparts 

 a "velvet touch" as well 

 as a lasting brilliance and 

 unusual durability. 



Put up in handsome leath- 

 erette gold -embellished 

 cases — a highly artistic 

 packing which they truly 

 deserve- 



Send lOc i°e": 



ful metal bdx con- 

 taininif 12 of our 

 most popular pens, 

 including the fam- 

 ous Falcon 048. 



Esterbrook 

 Pen Mfg. Co. 



New York 

 Camden, N.J. 





,00 



A Wide Variety of 

 Superior Microscopes 



For the teacher, the student, the advanced 

 research worker, or the man with a home 

 hobby for microscopy. 



lauscfi '|omb 



Microscopes 



In all models, accuracy, both optical and mechani- 

 cal, simplicity of operation and of adjustment, and 

 refinement of construction are fundamentals. Our 

 optical experience of over 60 years and our repu- 

 tation for scientific achievement assure you of 

 every practical requirement in a microscope. 



Model F2 (illustrated) costs $3 1 .50. Other com- 

 pound microscopes from $18 to $330 — simple 

 microscopes $2.30 to $ 1 7. 



Our illustrated catalogr gives full descriptions 

 and prices. Sent on request 



Special Terms to Educational Institutions 



gausch ^ Ipmb Optical (5. 



412 ST. PAUL STREET ROCHESTER, N.Y. 



New York Chicago Washington San Francisco 



Manufacturers of the famous Tessar and Protar Photographic 

 Lenses, Projection Lanterns (Balopticons) , and other high-grade 

 optical goods. 



