An Improved Self-Registering Bain-Gawge. 65 



of friction possible, while the fluidity of the ink by the use 

 of glycerine is such that, however lightly the pen rests on 

 the paper, or however dry the weather may be, the trace made 

 is always clear and unbroken. One of these pens charged 

 with about 50 drops of aniline and glycerine ink has traced 

 on our self-reonsterinof rain-^auo-e for two months without a 

 break. The ink used was a mixture of five parts of Coch- 

 rane's blue ink with one or one and a-half of glycerine. This 

 ink requires filtering before using, except when newly mixed. 



Reference to Diagrams, shoiving Side View, Plan, Section, and 

 Sectional Front View. 



a a — Board of well-seasoned wood, to which all parts of the apparatus 

 are attached. b — A metal bracket carrying the weighing system. 

 c — The clock for rotating record cylinder d. 8 s— The spiral springs. 

 v — The vase or receiver, g — Discharge funnel, h — Lower lever for 

 closing valve v. e — Delivery tube from rain-gauge outside building. 

 f — Valve chamber, a a — The syphon, b b — Guide wheels, g g — 

 Guide wings, m and I — Counterpoise and lever for valve, w iv — Wire 

 connecting lower lever with upper lever, p — The pendulum pen. 

 d — Nut and screw for raising or lowering the system so as to adjust pen 

 to zero on record cylinder, r and q — Pinion and wheel conveying 

 motion of clock to cylinder, which is removable from spindle s to 

 facilitate changing register-papers. h — The lever bucket which by 

 the first drops of discharge from vase pulls on w iv, depressing lever I, 

 and allowing valve v to close, o o o — Bracket carrying guide wheels. 



F 



