﻿298 



The Philippine Journal of Science 



1914 



connected by tubing through a T to a manometer and a rubber 

 bulb. 



To make an observation, the skin over the selected vein of the 

 forearm is swabbed with glycerol, the funnel is inverted upon 

 this area and is held lightly in place, A slight positive pressure 

 within the funnel seals the rubber flange against the skin and 

 the funnel itself may be raised off the vein. The collapse of the 

 vein may be observed through the g;lass sides of the funnel. 

 Hinged blocks for the pressure bulb increase the accuracy of the 

 results. 



Fig. 1. The thermoesthesiometer. 



A SIMPLE TIMING SYSTEM 



While most laboratories are satisfactorily equipped with a 

 time-marking system for class purposes, no very satisfactory 

 instruments of this kind are commercially available. In many 

 laboratories one finds timing systems which have been devised 

 and made in the school itself. The excellent electric clock which 

 is part of the equipment of the majority of American laboratories 

 is too delicate an instrument for continuous use or for supplying 

 a number of work tables. 



The apparatus here described (fig. 3) can be set up with a few 

 hours' work, and has given excellent service for twelve laboratory 

 benches. 



