[NP023] Technical Note, 1886-1888

"Possible troubles in F&H Thick dip is rendered migratory by pressure marks= Try curve on top mould showing no marks. noticed Ed had marks. Sheets absorb too much CO2 H2O etc notice bad results charcoal carbons dip sheets gasolene to displace H2O etc see if gasolene affects 17 or Kero; Perhaps 2nd prelim too slow 17 goes off-- Wrap Cot around cloth ^ not paste side moulds-- Study their dips-- Increase heat of dip to 125 or higher to get thick-- dry 175 & take pressure off-- Carbonize some in grooves in Carbon hot drip-- Run to 500 and hold only 1/2 hour then hot dip & run up in 1 hour hold 1/2 on 2nd= See if Carbons [drawing] as Ed was Try curve in box Dixons flake pbgo also electrotypers= find out how No 16 was run-- Try bunched say 200 with paper outside and wound with linen thread strong and run clear to final not taking them from prelim to dip but after Carbonzd dip and heat to 175 then in sheets & prelim in 1 hour holding 1/2 & then final also try bunching dipped prelim 200 & wrapped thread see if stick Have Deshler Duplicate 10 on the transformer= 10 lamps boiled anhy SO4 just dip in H2O instant then when on pump bring up through 40 lamps 10 lamps with drop anhyd SO4 on side of bulb just before sealing in-- stop acetyline-- [changes from pen to pencil here] Have Deshler test drop CP on 90 deg Lamps may be they hold up better hence lower life= Try SO4 strong in Cups instead phos anhy-- also both together See how much Current can be passed through fil while on inside part in Conc SO4-- without oxydz this current say 1 amp may do something= May be sheets gets gradually oxdzd & become rough & fils cant slide-- Use micro & pick out 10 dented & 10 not dented also ten with silver shine also 10 by heavy weight 10 with Maximum hairs Carbonize tissue paper lay between cloths plumbago 1/2 doz sheets previously dipping in very thin Dextrine Water & drying moderately & before dry brush plumbago over-- Run Curve-- Heat prelims plunge into 17 wholly so 17 runs up into pith pores which are large when looked end on then take out Rinse turp & put on board for reg dip-- Bend 10 Carbons various ways run Curve may be 17 surface cracks in handling-- Bend foil under micro see if crax can be seen Try Cotton plush carbonized See if Carbons stick to sheets when they are taken out mould. Breatk off that vitrous surface on mould see if that don’t make difference Try new mould-- Ascertain amount current Upton uses through fil to measure it-- possibly 1/10 ampere make inside arcing it contact & hence oxdzn Stick the fils in Cotton batton carbzd like needles in a pin cushion-- I suspect the slow [re prelim?] Cooks 17 all away-- [might be able to date re notes on dipping and prelim]

Edison, Thomas Alva

1886-1888

Technical Note

NP023-F

44:215

NP023

Thomas Edison National Historical Park

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University