Note on Safety Devise in Laboratory Electric
Muffles. |
PROF. M. L. JOSHI, & SUKHCHAIN LAL JAIN, M.Sc.,
Pages : 167-168
DOI : 10.1080/0371750X.1942.11011958 |
Abstract |
There is a general complaint m various analytical
laboratories that the element used in the laboratory electric
muffles very often fuses and requires replacement due to
over-heating. There are a number of electric muffles that
are fitted with automatic electromagnetic make and break;
but by far the larger number of laboratory electric muffles
working in the country are without the provision of this
arrangement. In these days of war, it is difficult to obtain the
automatic electro-magnetic arrangement. Due to the materials
of construction not being available, it is not possible to construct
this arrangement as a safety devise. As the laboratory
electric muffles are seldom required for temperatures higher
than 900°C, which temperature by itself is low enough to allow
more or less perpetual life to beating elements of the crosssection
generally employed. But due to no automatic control
available and due to the little negligence on the part of the
operators the temperature shoots up very much higher, with
the result that the muffles get damaged and require constant
repairs. It is becoming more and more difficult to obtain
even nichrome wire for replacement. The writers of this note
went into the question of construction of some automatic
control whereby the life of these mu:ffies could be prolonged
without much expense or worry. |
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