No coin nor oath required. For personal study only.
Iirivc reiitl with great interest tlic lcttcr on C'liemicril Stonewiirc i n your issiic of Scptcnibcr 29.
I \vns prcscnt t i t tlie tliscrissioii on lend-lined plrint iuiid clicmicril stonewire to \vliicli p i i r iirt icle of Septcm-Ler 2'7 rcfcrrccl. If Mr. Ihrrctt \voiiItl rcritl that nrticlc iigain lie \voultl find that the definite clriim of with-.;tantling n tcnipcriitnrc of 220" C. is nintlc for Ihitisli stuneivnrc. This is ccrtiiinly not '* ~iigiit*.
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order to ovoid tlic necessity for ii wntcr-bntli wit11 thermostatic eoiitrol, tlic bottle, wliicli Iins n tJicrinonictcr stoppcr, is provided with n glass bulb siiflicientiy liciiry t o sink in niiy orctinury fluid nntl hiiving ii rliniiicter nbout twicc t,liat of the neck of the bottle. With this a
SIR,--JI~~ I point out tliiit in your rcport of t.lw nlecting of tlic GIiisgow Section on October fi (CIII\*:M. S: Is])., Oct. 13, 11. SlS), you oinittcd tlic main point. of riiy sllggcstioii. This \viis tlliit thc rcsistiincc to t,llc rcliitivc inovcniciit of t,wo Iiibriciitcd surfiiccs, untlcr t,l
The Unit-Distance Graph problem in Euclidean plane asks for the minimum number of colors, so that each point on the Euclidean plane can be assigned a single color with the condition that the points at unit distance apart are assigned different colors. It is well known that this number is between 4 a