An instrument is described which allows measurements of leaf temperature within about 0.3 C. It consists of a special thermistor probe, a small circuit box, and a standard ammeter. The circuit box can easily be fixed to the meter and contains a battery, which passes 0.3 milliampere through the thermistor, and also contains an integrated circuit amplifier, so that the meter reads 20 C full scale...

following were miscarriages, and the last an abortion in December last. First attack of epilepsy occurred in the third month of the first pregnancy ; the last, two days before admission. The fits occur during the night; of this the patient does not retain recollection the following morning. The patient was under treatment from 22nd September to 22nd November, during which period 11 observations...

In experimental sciences, random processes often place a fundamental limit on the achievable resolution. A well known example is the Johnson noise voltage across a resistor. In this paper, we describe the observation of temperature fluctuations in a thermometer caused by the random transfer of heat in and out of it. This process places a fundamental limit on the resolution of a thermometer. We ...

This pamphlet consists of two lectures delivered at the Midwives' Institute. They must have been uncommonly dreary for the listeners, for they contain little else than the enumeration of various readings of the thermometer after childbirth and after the graver gynsecological operations. The thermometer is of course an indispensable aid in diagnosis, but it is easily possible to overrate its val...

A bolometer consists of a thermometer with heat capacity C mounted on an absorbing substrate, weakly coupled to a bath at temperature T0 via a thermal conductance G ( Figure 1 ). Resistive bolometers (including both composite and transition-edge bolometers) use the temperature dependence of a resistive element to measure the infrared signal incident on the absorber. In steady-state operation, t...